I have 93 Gmc safari 4.3 I am having trouble. It is running realy rugh just like it did about two years ago and I ended up having to put in a new cpi spider injector, and a new wireing harness. that fixed it but now the same problems are showing up agin and I need some help. I have already so far replaced the cpi injector, wireing harness, distributer cap, and cleaned out the gas tank. I dont know were to go from here. If you guy could give me a little insight on where I should go from here it would be greatly appreciated. :frown:

Welcome to AF, misfire, any check engine lites, exhaust fumes, fuel odor, need some more info, running rough is too vague.

It is not misfireing, and there are no check engin lights but I have one of those code readers where it gives you a code for however many times it blinks, I am geting a all clear signal wich means the computer thinks its fine. There are no fumes or oders being emited that I can tell. It runs ok some times and then it starts running horeable and it cant climb hills for any thing.:banghead: