[clints pony]

im having a timing isue with my car when i put a timing light on the marks at an idle the mark bounces all over the placebutwhen i rev the motor up and keepthe rpmsup the mork shows perfect right were it is supposed to be and at an idle the car wants to die on me any help would be great and i have all ready changed the timing chain

 

[R92stang]

1991 timing problem

did you do any work that would throw the timing off at all?

 

[Saleen302]

that can be caused from a vacuum leak or a faulty IAC valve.

 

[MarkS93]

Did you remove the spout connector? It is located on the end of an electrical connection hanging from your distributor. It's a small plastic piece. You have to pull it off before setting the timing, then put it back on after setting timing.
If you already did, I'm not sure of your issue. Like said, perhaps vacuum?

 

[clints pony]

i did not remove the post conectore and i havent done anything to throw the timing off i will check for a vacume leake and try that conectore thanks everyone for all the imput

 

[stock92]

It will bounce around a little with the spout in. Thats do to the computer adjusting timing constantly. If you want an accurate reading pull the spout connecter and check timing.

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[Smurf stang]

Pull this before checking your timing. Your ecu will constantly be adjusting your timing to help smooth out the idle.