1G 1991 Eagle Talon will run good one day then like shit the next.

[Allisterstratton]

When it runs good it runs good but I’ll let it sit for the night and try and start it and it just doesn’t want to and sometimes fires with an engine light and a bad misfire.

But then out of no where it’ll run good again. Any ideas?

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[steve]

Not much to go on here so I'll start with the basic. When it won't start does the Check Engine Light come on for 5 seconds and then go off when you turn the ignition on?

 

[dwb]

What's the CEL code?
When it runs poorly, does the tach read about half the RPM you expect? Power Transistor would likely be to blame if so (I'm assuming N/A uses the same PT as turbo models).

 

[steve]

Power Transistor would likely be to blame if so (I'm assuming N/A uses the same PT as turbo models).

The 2.0L 4G63 NA does. The 1.8L 4G37 NA doesn't.