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Re: lite tapping in engine,very ruff idle,stops when...
Ruff idle may b idle controll senc. ----tapping may be plugs-- wires, and or gas try 91 oct gas next 3 tanks and see thats the cheeepset place to start
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What happens if you give it a little gas ? Hold the RPM's up , will it keep running then ? How does it Idle , smooth or ruff ? Does the idle seam low ?
How does it idle in park , does it run ruff or smooth? Are any lights lit on the dash , check engine etc. ? Could have a partially plugged IAC air passage .idle air control (IAC) valve ! The engine computer uses the IAC to control idle , when under a load such as when put into gear the computer raises the idle ! It does this by allowing more air to by pass the closed throttle into the engine raising the idle ! If these air passages clog they restrict the air flow an cause a idle problem ! Now if it runs ruff at idle in park you could have vacuum leak ! Rough Idle How to Fix Ford Taurus Engine Stalls at Stop Signs
The naturally balanced configuration virtually eliminates shake and idle roll. The standard Vortec 4200 engine delivers the most horsepower in its segment - 275 hp with 275 lb.-ft. of torque for strong trailer towing capacity.--------------------------------------------------------------------------------------------- Audi-VW Airbag Reseter
It is most likely you wheel alignment (costs about 20 bucks to have your wheels aligned) or try checking the tire Pressure to make sure they're all even maybe hope this helps
Your EGR valve shouldn't open up during idle or the engine will run rough and may even stall. Remove it and clean the plunger and port with a wire brush and some carb cleaner. Test the diaphragm with a vacuum pump. If it doesn't work after cleaning, or the diaphragm is bad, buy a new EGR valve.
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