Cold start problem definition: Engine temperature and air temperature around 70-75 degrees Fahrenheit. Start engine w/o foot on accelerator pedal. Engine starts and goes to around 800 rpm (instrument panel tachometer). If slight pressure put on accelerator pedal to take rpm to 1500 or so, and then pedal released, rpm drops to around 300 and engine tried to stall and then picks up speed and then tries to stall. Slight pressure on accelerator pedal for a couple of minutes or so, solves the problem. Here is what I have done: New within the past two weeks are new O2-sensor, new Temp II sensor, and new plugs. A couple of months ago, I put in new rotor and cap. Timing is just ahead of the mark. I am also working with backup ECU and I have cleaned the contacts on large cable going into ECU. I have checked for vacuum leaks and replaced suspect hoses and fittings. Engine is Boston Bob rebuild that I installed in September 2003. Has about 40,000 km on odometer. Just about everything I could buy new/rebuilt at that time such as distributor and AFM went was replaced at that time. A few years ago, I installed a rebuilt throttle body. Recommendations on next steps would be appreciated. John |
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