Be really careful what you replace with. I had a GMC 4.3 ltr and replaced the plugs and wires at 100k as per service schedule. Was running fine before the "tune up". After replacing the plugs, wires and distributor cap that thing would start missing when it rained sometimes so bad it would stall out.

Took over a month of trouble shooting. Replaced wires, plugs and cap a second time no help. Finnaly turned a hose on the motor to find the source of moisure leak. Misting the distributor cap and the miss started imediately. Took that cap from advanced auto off and had a look. That cap was made so cheaply, the contacts were small hollow tubes sealed with a drop of solder. Moisture was getting in the cap.

Replaced the cap with a AC Delco cap and no more problem.

Just saying don't but the cheap made in China off brand parts. Those cheap parts cost me a bundle in asparin alone.

The AC delco cap contacts were solid, not hollow, insulation on wires was 2xs thick. Those china parts are designed to last a month tops.