hello i have a 1995 blazer 4.3 now i had a misfire on 3.5 and i replaced the spider unit (brand new) and claeaned the intake and brand new acdelco .. installed autolite platinum and i installed wires now im getting a misfire on 1 5 i dont know what to do i bought a fuel filter and i was going to install that tomorrow i was going to take the cat off and replace that also snap on comp is telling me that 1 5 and auto machine said misfire 306

going to take off the egr and clean it

going to to the map sensor and clean it

 

The Chev engines like nothing but ac delco parts, I tried autolite in mine and it ran ok for awhile but had to replace them, get an acdelco cap and rotor and see if that dont solve your problem

 

Well that's confusing on the reading.But here's what I cant understand. Even if you asked the exact question on a Ford forum, they would say:
Use the OE brand.. AC Delco
If Ford, order of fitment Motorcraft, Autolite, ACDelco
If Gm, AC Delco, Autolite... yadda, yadda

Not like AC Delco isnt on the shelves, If it isnt go to different store.

HOWEVER... you didnt specify what wires you used. They are critical. I learned long ago to keep the OE wires for a while if I replaced with aftermarket brand. And that lowest priced wires were prone to fail right out of box.

 

*Moved to '2nd Gen Tech'*

 

I use ACDelco wires on my Blazer as they are the OE for GM. Motorcraft is OE for Ford. But a lot of people have their favorite brand for replacement parts, and that is ok, to each his/her own, personally i use ACDelco on all my GM vech, well except my race car