[MT-2500]

Originally Posted by jdrobbins

Ok my son has a 93 Blazer W vin# with the 4.3v. It has a very rough idle and hesitates on acceleration and bad gas mileage. Also gas smell from the exhaust and if left idleing there will be a black spot on the ground.

It really doesn't use much oil. Has 180,000 miles.

We did a tune up a couple weeks ago which helped but did not fix the problem.

Plugs - AC Delco
Wires
Cap
Rotor
Air Filter
Oil Change

When we pulled the plugs the drivers side plugs were all black but the passenger side were burning good.

I have read alot about the nut kit and spider assembly. Could this be the problem here? I am going to pull the EGR valve tomorrow and clean it.

Thanks for any help.

Almost forgot, we had the O2 sensor replaced when he bought it. The latest code it gave was a 45 O2 sensor.

Run a fuel pressure test and watch for a fast leak down.
If so take upper plamtuim off and look for a fuel leak at fuel regulator or plastic intake and return lines.
MT