Engine Performance problem
1997 GMC Safari 6 cyl Two Wheel Drive Automatic 133, 00 miles
I just replaced the Mass Flow Air sensor and the throttle Position sensor and a new air filter and checked air intake ducting for cracks and replaced the hose from the intake ductiing that connects to the valve cover. Plus made sure all clamps were tight. What is still happening is a erratic idle under a slight load. With the car in gear, foot on the brake pedal and I turn the AC on, idle becomes erratic. In park idles fine. In gear with foot on brake pedal and AC off once in a while will have real slight erratic idle. The only other thing that will cause erratic power is under slight acceleration on a slight up hill grade will cause engine to run rough. I am not getting a check engine light. I have 3000 miles on a rebuilt motor with new spark plugs and wires. It was not until after I put on about a 1000 miles that problem began to happen. Just before I had the motor rebuilt the fuel pump quit. So I replaced it and the inline fuel filter next to the gas tank.
Tuesday, June 16th, 2009 AT 6:41 PM