1990 wrangler with a 4cyl was dying at idle found the vac line to the map sensor had a crack replaced it and reset the computer. Still dies at idle and now cuts out at higher rpm. Have to fan clutch th raise and lower rpm to keep it running????what could it be. Replaced map, plugs, wires, fuel filter etc

An emissions light brings the possibility of bad O2 sensors into the picture. Unfortunately, without a diagnostic test to help narrow it down, it's trial and error. It's also likely that you've got a combination of issues causing your problem. I'd certainly look into the O2 sensor (runs about $30) to clear up your emissions problem. It may cure the problem or at the very least, improve the engines performance. An emissions light brings the possibility of bad O2 sensors into the picture. Unfortunately, without a diagnostic test to help narrow it down, it's trial and error. It's also likely that you've got a combination of issues causing your problem. I'd certainly look into the O2 sensor (runs about $30) to clear up your emissions problem. It may cure the problem or at the very least, improve the engines performance.

Thank you sir Thank you sir