By 90 5.0 has been idleing pretty rough as of late. As soon as it cuts on it sounds like it wants to cut off sometimes it does but usually it would stay on and after about a couple of minutes it idel fine.
Also when coming to a complete stop and putting it into park it sounds like it wants to die but if I give it some gas it will sat one.
Anyone know what this might be? So far Iv'e done the following to the car.....
Trans rebuilt Spark plugs plug wires oil filter fuel filter fuel pump oil change air filter
89 LX Coupe: Factory 5.0, common performance and suspension bolt-ons (306 build inprogress) 86 GT: (current 1/4 project) will have primarily Team Z suspension and chassis additions, 408 with nitrous in the works 2003 Mach 1: programer, exhaust, 4.10'
have you ran any cleaner thru the intake? and some are opposed to it but i just added some Seafoam to my oil for a couple hundred miles before oil change and while running sprayed it gently through the intake and it actually helped smooth the car over alot, major differance for me anyway. i had similar issues.
btw ...what does "bump" mean? i see it all the time but have no clue.. good luck
Ok... for one, what air filter did you use? A cheap air filter can reduce or change the direction and amount of flow to create inaccurate readings from the MAF which in turn will give bad readings to the ECM and your car will run poorly. (I actually experienced this issue first hand.)
Two... Have you tried buying the MAF cleaner from your local dealership (Yes I said it... buy it from the dealer, the cheap stuff will damage your MAF) to see if cleaning your MAF will help?
Three... Have you checked your fuel pressure through the valve located on your fuel rails? The fuel regulator could be showing some signs of age. This is common on these year models.
Four... You could have enough carbon build up around your Throttle Body that it is causing some problems... Get some Throttle Body Cleaner from the Dealership.
Five... Check all your vacuum lines and ensure there are no vacuum leaks present.
Six... Your O2 sensors might be experiencing some failure, as they build up with carbon deposits they tend to give incorrect readings and sometimes go out all together.
Ok... for one, what air filter did you use? A cheap air filter can reduce or change the direction and amount of flow to create inaccurate readings from the MAF which in turn will give bad readings to the ECM and your car will run poorly. (I actually experienced this issue first hand.)
Two... Have you tried buying the MAF cleaner from your local dealership (Yes I said it... buy it from the dealer, the cheap stuff will damage your MAF) to see if cleaning your MAF will help?
Three... Have you checked your fuel pressure through the valve located on your fuel rails? The fuel regulator could be showing some signs of age. This is common on these year models.
Four... You could have enough carbon build up around your Throttle Body that it is causing some problems... Get some Throttle Body Cleaner from the Dealership.
Five... Check all your vacuum lines and ensure there are no vacuum leaks present.
Six... Your O2 sensors might be experiencing some failure, as they build up with carbon deposits they tend to give incorrect readings and sometimes go out all together.
Great info.. i will be taking you advice myself!! Thanks!!
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Rough Idle? - 
