My 1996 gmc sierra with a 4.3 vortec in it seems like its missing, even though i changed the spark plugs and wires, distributor cap and rotor it worked very well after i did that and now its back like its missing again. i took the plugs back out and check them and they all are firing. im kinda wondering if its anything to do with the intake now?

SOURCE: 2000 GMC Sierra 4.3L no spark at the plugs...HELP!

no codes. most direct components changed.
computer. take it out or have the truck towed to the shop/dealer to test the computer.

SOURCE: 1987 GMC Jimmy Distributor cap and Rotor replacement

A diagram may not be needed as its a reasonably easy fix to do on your own.the distributor ca p will only fit on properly one way because at the base of the cap locaters can only fit the distributor if they line up.When doing the spark plug leads do them one at a time and if nessecary write or mark leads as 1,2 etc .The rotor can only fit on one way but put a mark on the distributor to show where the rotor was pointing when you took it off and if it still points there when the new one is fitted.When changing distributor cap and leads they have to go to the correct place.Pays to mark the outside of distributor cap where the locating bits are On the new and old one.Fit the new cap and rotor then take a spark plug lead and fit to new cap 1 at a time.You can tell by lining up the marks on the outside of the distributor cap when you hold them one on top of the other.Good luck

Mike Vincent

• 358 Answers
• Posted on Jun 12, 2009

SOURCE: I have 96 gmc 350 vortec. missing really bad. Ive

ou need to check compression on all the cly. do you know which cly is dead?

SOURCE: I replaced distribitor cap and need to know firing order

I recommend you gert an auto maintence /repair manual from your local auto parts store for 20.00 or so for yor truck.

SOURCE: Can a 1995 4.3l vortec v6 from a chevy astrovan

yes i imagine so. they are the same block but with different intakes.