pre- ignition ,

**Butch2000** · 04-25-2010, 02:51 PM

Well my car is running great ! but , every now and then when accelerating, it will ping , then go away ? and then other times it feels like something is holding it back ? I have tuned it up , new fuel filter , etc , sometimes it works awesome ? then other times it's like you only have half throttle ? wierd ?
no codes other then the , cold air injection ?

**DaddySS** · 04-25-2010, 04:11 PM

If you haven't cleaned th MAF, do that. Make sure your coolant is good and and at the correct level, and check under the hood for any vacuum leaks.

**Cutlass** · 04-25-2010, 05:56 PM

any mods??

**Butch2000** · 04-25-2010, 06:12 PM

no mods , just a 3;73 gear ,

**Cutlass** · 04-26-2010, 06:01 PM

Oh wait...you're the guy who put a 98 Vette LS1 in your '99 WS6, right?
Well one thing to consider is the 98 vette and 99 f-body cams are a tad different. Maybe you need tune?

DUR Lift LSA
98 Corvette cam 199/207 .472/.479 117
99 F-body cam 198/209 .500/.500 119.5