Whats the best way to tell if your running lean or rich?

[Rick 91GT]

If you are running lean you need to get a larger injector, the FPR will only change it till the computer goes back into closed loop. The increased pressure of the fuel will help but the true way would be larger injectors. You could also back off the timing, it will help.

Orange on a plug could be rust? Charcol brown is what you want.

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