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doesnt want to idle

This is a discussion on doesnt want to idle within the General Help forums, part of the LSx Technical Help Section category; hey guys im new hear and need some help. i recently installed TSP 5.3l heads with a MS3 and got ...

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    doesnt want to idle

    hey guys im new hear and need some help. i recently installed TSP 5.3l heads with a MS3 and got there tune for it. it runs great for a while but when i make some hard pulls in it and start to slow back down for a light it wants to die the rpms drop to 500 and then go back to 1500 and it will keep doing this until i take off again. and i get a P0106 code. i switched out the MAF back to stock. i drilled the throttle body blade. i cant figure this thing out i need help fast i gotta go back to work

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    Senior Member TransAm11973's Avatar
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    what do you mean you drilled the TB blade?

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    Quote Originally Posted by TransAm11973 View Post
    what do you mean you drilled the TB blade?
    i think he is talking of the bump stop mod...
    could be a bad sensor... maybe an actual vaccum leak... or the cam maynot be creating enough vaccum... i dunno...

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    the blade on the throttle body i drilled a little bit bigger hole to let more air in and i tried spraying the vacum lines with starting fluid to find the leak but i couldnt find one

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    Quote Originally Posted by tcamaro98 View Post
    the blade on the throttle body i drilled a little bit bigger hole to let more air in and i tried spraying the vacum lines with starting fluid to find the leak but i couldnt find one
    bad idea... you need to get another TB... the ectra air coming in is probably throwing off your AF ratio... you are probably stuck in "limp home mode"...

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    it still runs the same as it did before i did it it only does it after some hard pulls and then i gotta slow down

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    i dunno... maybe your alternator is taking a shit... what kind of head gaskets did you use??? and what kind for the intake manifold???

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    i think the head gaskets are graphite and the intake manifold are the stock ones jus reused them

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    anyone else have any suggestions please help

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    The code is for a vacuum leak. I say after the romps it might have sprung an air leak somewhere. The TB needs to be replaced IMO after drilling it. I have had this issue and it was caused by a weak battery that wouldnt hold a charge. Check for a vacuum leak, maybe it could be something as small as the PCV or the brake booster...The TB needs to be replaced next.

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    Senior Member TransAm11973's Avatar
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    Quote Originally Posted by tcamaro98 View Post
    the blade on the throttle body i drilled a little bit bigger hole to let more air in and i tried spraying the vacum lines with starting fluid to find the leak but i couldnt find one
    yes definately need to replace that TB

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    thanks for the help any suggestions on how to check for a vacuum leak i tried spraying starting fluid around the intake manifold i have everything capped off.

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    Veteran 0rion's Avatar
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    I'll add my 2 cents. p106 is a map sensor code. Now whether it's being thrown due to a bad map sensor or because of the severe surging I don't know. Go to gearchatter.com and look at the dtc description for 106.
    What tune exactly do you have in there? I would probably bet that it's a tune issue. That's a fairly large cam so the tune would be very important.

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    the tune is whatever texas speed made it from there mail order tuning it only does this after i make hard pulls then slow down to a stop

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    Quote Originally Posted by tcamaro98 View Post
    the tune is whatever texas speed made it from there mail order tuning it only does this after i make hard pulls then slow down to a stop

    Id say you need to take it to a shop that can dyno tune it for you. Sometimes those mail order tunes are hit and miss.

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