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2003 chevy surburban has bad idol sometimes. Today everything died when I took my foot off the brake to go forward, put back in park and it started just fine. What could be the problem. Oil was changed a week ago. Problem for a few months now.
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Are you on any kind of incline that is putting pressure on the transmission? It does not take much of an incline to do this. Have someone help you by rocking the vehicle back and forth with the keys in the ignition but the engine OFF and foot off the brake and parking brake OFF. When it is rocking (forward and backward, not side to side) then try to take it out of park. To help you with this problem in the future (if this is the cause), put the parking brake on first THEN put the vehicle in Park.
I have seen this symptom and it is caused by a leaking power brake vacuum booster, when you apply the brakes it creates a huge engine vacuum leak and this causes the engine to run lean and rough and die in some cases. Most likely the shop was looking for an engine issue when it was a brake related problem
Back to the mechanic - sounds like either an IAC motor or TPS sensor is the problem, but also could be the throttle cable (sticking leaving the throttle not fully closed).
Most transmission control lever with cable lock bolt become lose in time need to re adjust position to the right place and tighten the bolts ,it can easily done by jacking up the suv and look under the transmission .
If you are parked on any kind of hill or slope, more than likely you have what is sometimes called "park lock." The only real way to do this is have someone in the drivers seat and one or two people rocking the vehicle. Do not apply the brake until you are able to move the vehicle into neutral. Once in neutral, apply the brake and start your vehicle.
it sounds like your shift lever is loose and now your Park/Neutral safety switch is out of position. Try, with foot on brake, holding key in start while you move shift lever slowly from park to low.
Release your parking brake :) Just kidding. Next time it does this sluggish thing, Put it in reverse and apply your brake, firmly and safely.then see if its still sluggish going forward. don't hit the brakes or hold then when you dhift to drive but don't dally and give the guy you just backed into a chance to get to you. Kidding. Ok, no more joking Starting out from a forward stop, vehicle feels sluggish. Stop vehilcle and back up a few feet stopping firmly. Now realese foot brake and put in drive, DON'T REAPPLY YOUR BRAKES SHIFTING INTO DRIVE.see if sluggishness is still present. If it is, Your rear brakes may not be fully retracting or they are over adjusting,adjusted. Automatic brake adjusters sometimes like to over do it. If your trans fluid is low, then maybe it can feel funny but not held back. If the back and forth thing provevs to free the brakes then have the brake checked. But seriously, to save embarrassment make sure your parking brake is FULLY RELRASED. Good luck and please let me know if I've helped you.
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