Injecting WAY too much fuel
I own a 2000 wrangler tj with the 4.0 in it. Over the last few months its had a problem that gets more and more frequent. It will start missing and backfiring. It starts sucking air like a jet engine. Somethings telling it to inject too much fuel (im pretty sure. If you think im wrong please tell me what you think). Tried one o2 sensor so far. (Money is tight). Cant afford to get it scanned on a live scanner. Its not throwing fault codes though. But im pretty sure its a sensor and crystlers famous electronics are to blame for the no code. I want to test my sensors with my meter (i have all i need. Im a mechanic). I know the o2 sensor is supposed to be between .1 and .9 volts. But i need to know the voltage/resistance for the TPS, CTS, MAP, and CKP.
Im going to take apart the intake manifold and clean it all up. Maybe my cat is no good, any way to check?
Any ideas, voltage/resistance specs, and any other info would be greatly appreciated. Thanks in advance.