Alright, I may be alble to help. Same exact problem on mine, the tach would jump from nothing to engine speed and the car would misfire. there are three possibilities cam sensor is the cheapest but least likly, you already changed the DIS so probably not although most auto parts stores will test it for free if they have a module tester. last is the crankshaft. the harmonic balencer on the supercoupe is notorious for breaking off on the end of the crankshaft.if its starting to go it will probably wobble. DONT DRIVE THE CAR, IT WILL LEAVE YOU STRANDED!!!!! and most likly when it breaks it will take out the crank sensor with it. its a ***** getting the broken bolt out of the crankshaft and the broken balencer off the end.
where are you in wisconsin?
85 Pontiac Fiero 2.5L auto RIP
86 Pontiac Fiero 2.5L five speed RIP
90 Ford Thunderbird Supercoupe 3.8 5 speed DD
99 Crown Vic police interceptor 4.6 auto
Last edited by Rodeo Joe; 11-08-2013 at 05:52 PM.
Reason: Merged posts