zbigity

i have an 87 gt that has a misfire. I have replaced plugs,wires,car and rotor. would the tfi module cause a mis also my rpm gauge is going nutz it is steady at idle but when i give it gas it move the wrong way. please help

GT350

Its not grounded good, or you have 2 wires swapped wrong.Your tach works off grounding.

nitrous_bob

what plugs ? what gap ? try closing them up to about .045" and only use copper plugs, no platinums

usually the dizzy module works...or it doesn't and won't even start