I have a 1990 Olds Calais that I am trying to make a custom show car. Idles fine when in park but idle really rough when put in reverse or drive until you accelerate. I checked for vac leaks and cant seem to find one though that is how its acting. Replaced egr valve, o2 sensor, manifold air temp sensor, map sensor, collant temp sensor, spark plugs and wires. No check engine light. One mechanic of the many said he put it on computer and nothing came up. I also replaced radiator and hoses and it has a brand new battery. Not sure what else to do need help!
Wednesday, September 12th, 2012 AT 6:33 PM