If the Check Engine Light is indicating, you would have to retrieve the trouble codes to see if any of the sensors are malfunctioning.
Did you check the ignition timing?
What is the idling speed?
When replacing the spark plugs, did you notice any oil in the plug tubes?
Get the spark plug wires ohmed out to see if any is faulty. Should have continuity with less than 25k ohms.
Get a compression test done to see if any cylinder compression pressure is out of specs. If yes, try adjusting the valve clearance and retest.
Tuesday, August 10th, 2010 AT 8:04 AM