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Thnx

Ok heres the codes I got: P0300 Random Misfire P0138 O2 High Voltage P0140 O2 Circuit No activity P0141 O2 Heater Circuit P0151 O2 Circuit Low Voltage P0161 O2 Heater Circuit Bank2 Sensor 2 P0174 System too lean Bank 2 P0420 Catalyst System Efficiency Below Threshhold Bank 1 P0151 Circuit Low...

Im gonna replace the plugs and wires first and see how that does.

I just bought this from a buddy...I'm sure he didn't have much done to it... Engine was rebuilt 60g ago and the tranny 70g ago... Plugs look rather rough on it from that I can see if the outside of em. Haven't taken on out yet.

There were several...he didn't give me a complete printout. It says random cylinder misfire on the one little slip he gave me. He read em out to to me as the O2 sensors. And the mass air flow.?

It was showing P0300

My Tahoe is idling rough...Hooked it to the comp..threw 22 troubles. All 4 O2 sensors and mass air flow sensor. Would replacing the mass air flow eliminate most of these troubles?

Ive got a 1999 Tahoe Lt 4x4...When its in park it "shudders" so to speak. Hooked it to the comp and it showed 22 codes... All were O2 sensor codes from all 4 sensors. It also showed a Mass Air flow sensor code as well. Would replacing the Mass air flow sensor get rid of most the O2 codes?

Glad to be here folks...From E. Tennessee.