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That is interesting. Usually it's the other way around. If your check engine light is on and you have a P0171 and/or P0174 codes, Then check the mass airflow sensor and the tubing between the MAF and throttlebody. If the check engine light is not on or you have P0172 and/or P0175 codes, then check the air filter, air filter box, and tubing between the air box and MAF. Also, check to see if the throttle body has excessive buildup and if so, service your throttle body. The codes may help you narrow down the root of the problem. Otherwise check and clean all the air ducting going into the engine and replace the air filter.
no I don't think so , it is only the torque converter clutch engaging and disengaging due to engine load. if you want to test this. go on steady speed over 50 mph no gas pedal movement. touch lightly the brake pedal but not braking and release . during this see the rpm drop down and raise
I really need to know exactly which lights are on. If it is the change oil in the information box then you turn the ignition switch on, push the gas pedal down fully 3 times, turn the ign off. Then start the car and if it does not come on, then it has been reset. Sometimes you have to do that several times before it will reset, not sure why. I'm not sure what you mean by ABS and etc.
my 2000 pontiac has code 420 when on idle is ok on drive or park I step on the gas it drives like motor mounts are broken I let the gas go and it rolls good I change coils wires plugs crank shaft speed sensor I even took of converter thinking it was plug it,on stray pipe replace EGR and still have the same problem, please help lucky fly 119@ yahoo.com thanks