DaveT Posted 2 hours ago Share Posted 2 hours ago This car is in a garage, driven a couple times per week. Suddenly, yesterday while driving, - Runs rough. Idle, dies. Idle in N dies. I did manage to drive it home, Seemed to run ok down the road, not acting like starved for fuel. In N, press the gas and hold, the RPM goes up, [example 2500]. Then after a second or 2 drops about 500, and the roughness returns. Does this regardless of what RPM you get initially - goes up, then drops back. Does this hot or cold. Capped the vacuum tap on the passenger side, no effect. This eliminates EGR, Evap, HVAC controls as possible culprits. Capped the vacuum tap for the brake booster, no effect. Distributor cap & rotor look normal, not loose. Timing belts are good, not jumped. Swapped the MAF, no effect. Swapped the IAC valve, no effect. CTS has nominal normal readings. Fuel pressure normal 22-23 PSI. Ignition coil & igniter swapped, no effect. ECU swapped - Still runs crap / same, but doesn't quite die at idle in N Running out of ideas.... Link to comment Share on other sites More sharing options...
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