I have already checked/tested the ignition module-ok. changed the coil pack. still runs rough. i checked the plugs, 2 are not responding. driver side rear, and passenger middle plugs. what do you think the problem is? a fuel pump, maf sensor, or something else. when i put the new coil pack in, no difference, still ran really rough. rumbling like a built 350. i then was running the bravada last night and found out the pcv upper boot was blown out. i changed that and it ran smoother. any help would be great, i have wasted my entire vacation trying to figure out what i need to do. well right now it is miss firing on the 5 cylinder and it is running very rough could you help
Check for bad spark plug wires or wires connected to the wrong cylinder.
SOURCE: 96 old bravada multiple misfires
on those amung other there is a wire from the module to the crank sensor it might have melted and be shorting out. make sure its not melted between the sensor and the module. they mainly melt after awhile.
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You do have a 4.3 V6 Vortec on a 1996 Baravada? Did you check the distributor and changed the cap and rotor??? The caps and rotor's are know to crack and moisture accumulate in the distributor do to clogged air vents at the bottom of the distributor.
There should be a screen that promotes the distributor to breath to keep the moisture from forming but it's know to get dirty and the moisture corrodes the wires in the distributor. Where your cam shaft sensor is also located.
See if you can have the Bavada scanned at Auto Zone since it's free there. See If you have and DTC codes and to make sure it's a ignition problem and not a fuel injector problem.
Good luck and hope this helps. Keep me posted
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