I have a 94 blazer 4.3 it run bad I've change pretty much everything I could think of even to out the converter the truck starts up fine but when I give it gas it back fires and no power I disconn

SOURCE: 1996 ford ranger -3.0 ltr

Had a similar problem and it just ended up being the sensor for the EVAP controls.  Stupid I know but it fixed the rough idle. Error code was P1443. Worth a try.

Marvin

• 85242 Answers
• Posted on Nov 04, 2008

SOURCE: I went to Midas with

I have no idea, you will need to contact the dept of consumer affairs and file a compaint with them.

SOURCE: my 94 s10 4.3 vortec was running very rough

Hello;
Make sure the distributor wires are hooked up and making a goodconnection at the base of the distributor. Also make sure the coil wire is fully in the socket. Make sure no wires got pinched for the relays. Hope this helps;
Thanks;
Rich
RPM Northwest

SOURCE: O2 sensor problem, running rich. Please help

was the code for rich or lean? may try cleaning mass air flow sensor. it is in the air intake tube and has a flat wire connector. take out of tube and take four torx bolts out and clean with mass air flow cleaner or brake cleaner and put back in when dry. or it could be a bad wire on the o2 harness. look for chaffing or broken wires in harness by o2. also could be the exhaust system has a slight blockage. could also be some other things but try these first.

SOURCE: 1998 Chev Blazer - hesitates, sometimes backfires, initial take-o

I fixed a van with the same problem. I had to reprogram the computer. It shuold be the same idea with your truck.