1989 GMC 1500 series
Check you distributor cap, plugs and wires. The cap is most likely the issue. Best of luck!
Your describing the classic GM ignition module failure, so Replace it and if the distributor pickup coil has never been replaced I would do that also, that way both the signal generator and the control module can start out fresh.
And don't go the cheap ones, or you will be right back in the to do it again.
Ok thanks , I will try all that was said n get back with you both
Looking for a Used Sierra 1500 in your area?
CarGurus has 57,111 nationwide Sierra 1500 listings starting at $888.
Search GMC Sierra 1500 Questions
GMC Sierra 1500 Experts