1998 chevy blazer running really rough. It used to ruh fine for a while, then after about 20 minutes starts losing power. Now it want go over 35 mph at anytime and loses power and comes to a stop.have replaced the spark plugs and wires, ignition coil, O2 sensor, map sensor, EGR valve, mass air intake sensor, fuel pump, and fuel filter. Does any one have any answers before I light a match to this thing.
I had a similar problem and just happened to unplug the temperature sensor for the computer and the engine started running smooth.
So I replaced the temperature sensor and all was well!
Most likely non of what you replaced was bad. You don't have any troubleshooting or diagnostic skills. My suggestion would be to take it to a professional or light a match to it.
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