why does my tach needle jump around when @WOT

[LX XLR8R]

Originally posted by PKRWUD:
if it started after you swapped the TFI module, go buy a new one. Since you can feel it as well as see it on the tach, it's not the tach. I doubt it's the coil, either. The tach registers competed ignition circuits, which is why you will see a dip in the needle if you have a fouled plug. Just because it's wired before the coil, doesn't mean everything after the coil is good.

Sounds like a TFI module to me.

Take care,
-Chris

hmmm...my car does seem to run a lil better after i change my plugs but my plugs are the complete opposite of rich...i am running crazy lean up top..plugs are as clean as they came out the box..lack of fuel wouldn have anything to do with the needle jumping around would it though?could i been burning plugs up???and it doesnt do this all the time..it varies but when its doing it bad its real bad


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1987 black notch(ex 4 banger)
DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one..
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