I have a 1994 T/A So i thought it was the gas station i was going to but I've switched gas stations. The problem seems to be getting worse. car will jump at idle from 600 or 700 to 1k and its constant after car runs for a few minutes. Yesterday the car started to do this as i was driving jumping from 2400 to 2500 rpm. At a lose pulled my plugs and they couldnt look any better other than right out the pack. will look at plug wires to make sure i didnt burn one up but i dont know if this is the problem. I have changed my opti to a MSD vented with MSD wires. Could my fuel filter by causing this or am i a yard off im at a lose i just want to fix it.