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my freind has a 1991 lx 5.0 it has been running great up untill a few weeks ago when he put a set of 24lb injectors on it. when he added them on his engine began to smoke a greyish dark smoke we finally figured out the proble was too puch fuel pressure so we took the gague off my car and adjusted it and it stopped smokeing its been two or three weeks now and all of the sudden it started smoking agin is there anything we can check to help trouble shoot this problem or is the engine on its way out? thanks.
 

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Check for any leaks first...it could even be a slight oil leak somewhere, if he has a breather see if it's leaking/smoking from there. Other than that recheck fuel pressure. If it's smoking from the exhaust you have other/bigger problems. HTH
 
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