Try putting the old Ignition module back in. I never had any luck with after market ones, its worth a shot. Remove the K&N filter too. Replace one at a time tho to see which one it is.
BTW its possible to get lean miss-fire, if the mixture is too lean. (read: free flowing intake)
Cheers
i have a 98 c1500 with the vortec 4.3 v6. my check engine light just
> came on today while i was cruising down the highway. i took it to
> autozone and used their scanner... it told me it was a random multiple
> cylender misfire. the truck dosnt have a rough idle and the mid rpms
> are good the engine dosnt shake or anything so i thought maybe it was
> just the plugs loaded up... i know it really couldnt be that but it
> gave me an excuse to beat it. so i got on it in first and took it
> almost all the way up, when it hit 4 grand it made a loud backfire and
> blew a ton of black smoke but ran perfectly fine afterwards and the
> check engine light is still on.. i have not a clue whats goin on i
> replaced damn near the whole ignition system about 3 months ago... ac
> delco professional platnum plugs, autolite wires, new cap, new rotor,
> ignition coil, ignition moduole, crank position sensor, and i put a
> k&n air filter on it. any help on this situation would be greatly
> appreciated thank you.
> keith
>
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