Anyone got any idea? It idles and revs like a champ but as soon as it i put it in drive it wont burn out or go fast. Ive replaced wires, plugs, 3 o2 sensors. Codes 300-122-174-100

 

P0100 = MAF sensor reading is not changing when it should. Could be a faulty MAF sensor, a damaged MAF harness connector, or you've lost the 12V power to the pink wire in the harness connector. Key on, connector off MAF, check for 12V between the pink wire and the black/white wire in the connector. If you have 12V, substitute a known good MAF sensor. Clear code, see if it comes back. To clear codes, pull the "PCM BAT" fuse for 30 seconds.

P0122 = Throttle position sensor low voltage. Key on, harness connector off the TPS sensor, check for 5V between the gray wire (5V reference) and black wire (ground). If you have 5V, reconnect, and measure the voltage between the dark blue wire (signal) and the black wire. With the throttle blades fully closed, should be between 0.20-0.90V. The code sets when the voltage drops below 0.20V. Slowly open the throttle, watching the TPS voltage. Voltage should increase smoothly to about 4.5V, with no spikes or dropouts.

P0174 = Bank 2 (passenger side of engine) fuel trim system lean. The O2 sensor on that bank is reporting a lean condition, and the PCM has started to add extra fuel to correct the lean condition, by increasing the long term fuel corrections. The corrections are approaching the upper limit of the system, and it still looking lean. Could be a faulty pre-cat O2 sensor, faulty wiring to the sensor, sensor signal wire shorted to ground, exhaust leak before the O2 sensor, severe misfires on that bank of the engine, or a vacuum leak that only affects that bank. Could also be a plugged injector. Could be low fuel pressure, although that would normally affect both banks of the engine. But you could check the long term fuel corrections on the driver's side of the engine to see if they are also elevated, just not enough to set the code. The problem with the MAF sensor can cause it to run lean, but again, that would affect both sides of the engine.

P0300 = Random misfires detected. If you have access to a scanner with "GM Enhanced Parameters" you can pull up the misfire count by individual cylinder to see if its really random, or perhaps on specific cylinders.