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Hello and welcome!My name isCustomerand I can assist you with your question.
Can you start by sending me a list of things you have replaced up to this point?
Also, any stored codes in the computer and your VIN would be helpful too!
Thank you for that information. Was the crankshaft position sensor replaced?
Ok, if you clear all codes, which code comes back first?
Do you know what the distributor sync or indexing is set at?
Have you checked for plugged exhaust?
What is the exhaust back pressure at?
How about the engine vacuum?
Ok, no problem. Sounds like we have several things to check. First, lets start by checking the distributor indexing. This is very important that it is set correctly. To do this, bring the engine to Top Dead Center number one cylinder and remove the distributor cap and check the position of the rotor tip to the distributor cap tower. If it is indexed correctly, the rotor tip should be leaving the number one tower, on its way to the next cylinder on the cap, 0.020 inch away from the number one tower. If needed, loosen the distributor hold-down and adjust. The hold-down may need to be modified in order to make this adjustment.
The exhaust back pressure should be no more than 1.5 psi at 2500 rpm. Just because the converter is not plugged up does not mean the muffler is not plugged. I have seen it many times before.
Also, the engine vacuum is a very important test. This will tell us if the engine is breathing good. Maybe we have a loose or jumped timing chain. Late valve timing or even an intake restriction. This will all lead to poor engine breathing issues which will show up on a vacuum gauge. It should be approximately 19 inches of solid steady engine vacuum at idle.
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