ok so my 94 is running really badly! basically I've been wanting to trouble shoot it myself but i find my self just way to busy right now. So its a CPI 4.3L it runs rough at idle cold or hot and while the rpm's are up. I'm getting HORRIBLE mpg's (like 5 to a gallon D: ) running real rich as well, can smell gas like no tomorrow, and sounds choppy (kinda like cam chop lol). I have plenty of power so i don't think it miss firing. Oh and one last thing when i drive it for 20 minuets or more, when i turn it off 1 or 2 cylinders continue to fire for a split second. Any help/ideas on to what is causing thins would be great

Thank guys! and have a good one!

 

It sounds like your timing is a little off and you need your injectors cleaned. And it could also be your fuel pressure regulator. Hope it helps.

 

Sounds like leaking fuel injectors and/or nut kit. Do a leakdown test and post the results.