if all my spark plugs, wires, and distributor cap are all new and my car is still missfiring what could the cause be? i have to keep the ac on to turn the idle up and keep it from missing and shaking really bad then once im up to speed about 20mph or so it drives perfect until about 70-80 mph and gets the shakes. what could be the cause any help would be appriciated. 01 nissan altima twin cam 16 valve pretty much a 240 engine lol

Asked by Aug 17, 2016 at 04:09 PM about the 2001 Nissan Altima GLE

Question type: Maintenance & Repair

if all my spark plugs, wires, and distributor cap are all new and my car is still missfiring what could the cause be? i have to keep the ac on to turn the idle up and keep it from missing and shaking really bad then once im up to speed about 20mph or so it drives perfect until about 70-80 mph and gets the shakes. what could be the cause any help would be appriciated. 01 nissan altima twin cam 16 valve pretty much a 240 engine lol

1 Answer

109,805

Low fuel pressure and dirty fuel injectors can cause a misfire, also an intake runner leak. I assume you have already double checked your work, made sure there wasn't a cracked spark plug. has the check engine light even came on during the shaking? if so a code check could shed more light on the misfire.

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