Hello, I just bought a 99 SOHC Automatic neon. My problem is when the car heats up to normal temp while driving, probably 6 or 7 miles, The car gives a sudden sputter when shifting from first to second. If i continue to drive the problem gets worse. When starting from a stop, it will loose all power right before it shifts, and almost dies. Eventually this leads to the car stalling. Also if i dont shut the key completely to the off position it will not restart. Runs perfectly fine in park or neutral, no misses, no bogging...Only when i try to drive it. I did the key thing, and i am getting a code 11. Now the Crankshaft sensor, and the camshaft sensor, and computer. have been replaced, Along with the spark plugs. Cam and crank sensor are new and computer is salvage. All done by me. And from what i can tell, the fuel pump is new too, but not by me. I also learned it has had a salvage transmisson installed. Any help would be great. Thanks

 

try checking for vaccume leaks.

 

Your idle sensor on the throttle body could be failing as well. When you shift the revs go down. If the sensor does not "catch" the idle before it stalls...you get the gist.