This truck has about 110,000 on it. It is not driven much. I noticed this fall and now into winter that when I cold start it, sits over night or an extended period of time, it starts, but runs rough, almost like it's missing or fowling out. This seems to go with the outside temperature, the colder it is, the rougher it runs. It also seems to run rich. Within a minute or so, no problem, runs like a champ. Recently I replaced the egr valve, the knock sensor, gave a full tune-up and flushed the coolant system. I've also checked for vacuum leeks around the carburetor and replaced the pcv valve vacuum line (the old one was cracked). A friend was thinking that the fuel pressure regulator was bad, so we rebuilt that. Since then, it still runs rough at a cold start. Is there anything else that I could look at? I've been around vehicles and not afraid to work on them, just can't figure this one out. Really could use help in figuring this one out.
- posted
20 years ago