Buick Repair Questions? Ask a Mechanic for Answers ASAP
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I assume you had a code 300 for random miss fire?? if you did, the most common issue is low fuel pressure. I would start with getting a fuel pressure tester and checking the fuel pump. it may be low enough to run the engine but not give good performance.
thats the last thing I would go to.
you need to start with a fuel pressure test to verify the pump is good.
I read your original post on this post, yes.
I read your post but I do not guess or throw parts at a car without confirming a failure. anyone who is a tech has a process of diagnostics and follow those processes until you find the failure, then you replace the failed part.
I am sorry if you dont agree with that. maybe someone else can help you with your guessing to see if you find the failure.
your primary problem listed is the random miss fire.
when you tell me things are fine, I need specifics. I take no ones word for anythng as I dont know them.