I have a strange idle problem that I need help with.
I have a basically stock 89 GT. When the motor is cold it cranks fine, but after the motor is warm and I start it up it runs crappy for about 2 minutes and then like someone flip a switch it idles and runs smooth. During the first few minutes of starting it surges from 500 to 1500 rpms and sometime dies. After it clears the motor runs fine no surging or dying. I did a tune-up less than 6 months ago (wires, plugs, rotor and cap, ect) , I have checked and cleaned the MAF, IAC, Throttle body, Pull codes nothing shows up, Reset the base idle, checked and set TPS, replaced o2 sensors less than a year ago and replaced the ECT two weeks ago. Checked for vacuum leaks. The EGR has been deleted along with all the other smog stuff few years ago. I have noticed that if I try to drive the car during these first few minutes of starting I do not have any brakes so I have to sit and let it run till it clears up. This just started a few weeks ago and other than the problem with start-up the car runs great. Any ideas would be greatly appreciated.
I have a basically stock 89 GT. When the motor is cold it cranks fine, but after the motor is warm and I start it up it runs crappy for about 2 minutes and then like someone flip a switch it idles and runs smooth. During the first few minutes of starting it surges from 500 to 1500 rpms and sometime dies. After it clears the motor runs fine no surging or dying. I did a tune-up less than 6 months ago (wires, plugs, rotor and cap, ect) , I have checked and cleaned the MAF, IAC, Throttle body, Pull codes nothing shows up, Reset the base idle, checked and set TPS, replaced o2 sensors less than a year ago and replaced the ECT two weeks ago. Checked for vacuum leaks. The EGR has been deleted along with all the other smog stuff few years ago. I have noticed that if I try to drive the car during these first few minutes of starting I do not have any brakes so I have to sit and let it run till it clears up. This just started a few weeks ago and other than the problem with start-up the car runs great. Any ideas would be greatly appreciated.