Jacob_Ayala

Hello to all,
I am new to forums so please bear with me. I turned to the forum when my auto mechanic failed me, and I have absolutely no experience with this issue. So to begin I will give you a history of the car while it has been in my possession. The car is bone stock with 98,xxx miles on it, about a year ago it sucked a valve, as a result, we rebuilt the entire top end. We had also recently (last 2,000 miles) done a complete tune up, this included injectors, spark plugs, air filter, and fluids.

Now for the problem. When I first start the car after it has sat for a while and cooled down to the outside temperature it runs great. It feels smooth and does not hesitate at all. Even when it warms up to optimal temperature. It is only when I start it after it has only sat for a hour or less it begins to run bad. What I mean by bad is that at idle it has a physical shake that you can feel when sitting inside of the car. The RPM's are normal as this happens. The problem continues when I drive as well, it shakes when accelerating, but happens the worst when the transmission is in a high gear going up a hill. I have read the codes and it put out two codes a 21 and 24. Have replaced the ECT, but it did not fix anything. Any help will be helpful. Thanks!

88 orangepeel notch

This might not be your problem, but with cars our age, a vacuum leak in the aging vacuum lines really can cause alot of the poor idle/ rough running conditions. I'd start there seeing you don't have any other codes.

Did you reset your computer to clear existing codes ? You might need to put a couple miles on it, giving the computer time to relearn parameters.

Good luck

mjr46

please read forum rules....1 thread, not multiple threads in different sections regarging your issue.