i put a rebuilt 350 motor in my 86 iroc. The car will start but it is very hard to do so and it doesnt seem to run well. I believe i did all the right things, put the right kind of chip in, set the base timing and all the electrical is hooked up correctly but apparently something isnt right. Could it just be bad gas. The gas has been sitting in the car for a while. Any feedback would be appreciated.