Re: 2.5 running rough
ok the truck has a 4 speed manual trans. And it idles very rough but seams to be running rough all the time. The vacuum is pluged with a bolt that the previous owner or someone put there. So I know that its not "factory" I'm not sure what TBS is on it. I did just change the O2 sensor because the old one was bad and that allowed me to time it at the recomended 8 degrees. But it still runs rough. Like it is missing or something. I've got spark at all 4 cyl and checked everywhere for a vacuum leak because thats what it acts like. Thats when I found the line at the very back of the base of the TBS plugged off and I cant find where it goes.
92 S-10 Blazer 4x4 Vortec 4.3
85 S-15 Pickup 4x4 2.5 iron duke