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Q: what would cause a car to sputter and have no acceleration/power. on 1999 Mitsubishi 3000GT SL

here's everything I can eliminate right off the back: Spark plugs, spark plug wires, oil, solenoid, bank2 sensor2 02 sensor, spark plugs, and ignition coils. The check engine was on before I changed all of this and is now off, but still absolutely no difference in performance. it turns on good, when I put it in drive and hit the gas it barely moves until I push it all the way down. theres slight knocking in the engine but it comes and goes, I tested the pressure also and its good, so the engine still has power. what would it be!!?
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im kinda new to working on cars, what and where is the maf sensor? and the maf wires? if not then which wires?
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If your wanting to work on your car, I would suggest you purchase a car repair manual for your car first, so that you can read some of the do's and don'ts of repairing your car. The wire sensors inside of the MAF not the wires to it. It's in the line from the breather to the intake manifold.
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