aight im having a problem. here goes it
getting a check engine light with weird things happening i.e. auto meter tack and stock tack jumping around??? bogging down kinda? n e ways check engine light was a code 3 and so i changed the map sensor(with a used 1) but still doing same thing, for some reason i am thinking coil any suggestions?
i have a vafc hooked up which is connected to my map sensor so i disconnected the wire for the map sensor to the vafc and connected the wires back together( like it would be stock) and it ran even shittier????????? then hooked back to vafc. think maby i got a second bad map sensor???

 

does no one know????????????

 

If you happen to have a spare good working O2 sensore trying swapping it, a buddy of mine had a problem like you and all it was, is the O2 sensore so try doing that.
-Aaron-

 

cool ill try that

 

i got it fixed. it was loose connections under my distributor cap causing a misfire.

 

yeah i was gonna tell you to check the dizzy....thats what your tach gets it's reading from....