Expert: Mark Bisig - 10/8/2005

Question
hello.i have a 1993 chevorolet s10 2wd with the 4.3 engine.heres problem i can be riding down the road at any speed my truck starts 2 sputter and jerk then stops 4 awhile then starts 2 again.i tried alcohol in take fuel injection cleaner premium fuel and i'm still having problems.my truck has went from 24 miles a gallon 2 abt 15.i need 2 know asap what i need2do 2 fix problem.any info will b apreciated.

Answer
Hello Kevin, The first thing to do is replace the dist cap,rotor and plug wires, if this hasn't been done yet. If this engine has CPI injection there could be a problem with the injector. They have a fuel pressure regulator that is inside the intake manifold and when the regulator diaphame goes bad it will leak gas and make it run rich on the #2 and 4 cylinders. This problem is most notice at start up, the engine will run very rough for a couple if minutes then clear up.

Hope this helps

Mark