Car has an irregular idle.
 

Hey guys,

When I put my car in park it has a bad idle, sometimes it even stalls, can anyone help me out with this ?

Thanks a bunch
Abe

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1990 Mustang GT Convertible, Blue with Grey ground effects and white top. Black Leather interior pw,pl,ps,pm, premium sound system. All stock =(

The first thing to do is read the codes from the computer. Do a key on engine off and key on engine running test.

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351W 89 Mustang GT Convertible

whoa! Hold on there lol, how would I got about doing that, do I need some equipment, would it be best just to take it somewhere...this town is known for ripping people off with cars so thats why I waited.

Thanks a bunch!
Abe

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1990 Mustang GT Convertible, Blue with Grey ground effects and white top. Black Leather interior pw,pl,ps,pm, premium sound system. All stock =(

As far as equipment goes, all you need is a wire.

Check out this article from corral.net.

EEC-IV Testing

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351W 89 Mustang GT Convertible