Hello all, I posted a question on this forum several months back asking why my 1997 S-10 w/ 2.2L4 had a rough idle and would stall out when stopped with the A/C compressor on. At the time, I received several possible answers from a clogged catalytic converter to a malfunctioning throttle position sensor. I finally took the truck to a local mechanic who ran a complete diagnostic on the truck and found that the number 4 cylinder spark plug was gas fouled. After much discussion, we determined that the culprit must be the number four injector that I had replaced several months back. I had replaced the stock injector with an off-brand, lifetime warranty injector from Auto Zone. My mechanic had noticed over the years that the only injectors that work properly in the 2.2L4 found in the S-10 and caviler is AC Delco. He didn't have an answer as to why this was, but as soon as I replaced the off-brand injector with an AC Delco, my problems cleared up immediately. So if your S-10 is running rough and you just changed injectors with off-brand equipment, that may be your problem.

Thanks for the info.

Great example of "You get what you pay for"
Thanks for the info!

My 98 s10 2.2 starts fine but back fires and idels like its runing on two plugs . It started about a month a go every time it raind now its realy bad cant even drive it just no power when i give it gas