okay I changed the mass air flow sensor from the junk yard with the right bosch part#. The car runs significantly better, however it has no power and backfires when I start out, but when I get it up to road speed it is fine. I noticed that it does not do this so bad when the car is warmed up. So... did I get a bad half functioning air meter? I drained the gas and filled up with high grade quicktrip gas and put stp injector and valve cleaner with the gas, still same results. The pumps, filter, plus wires rotor button and cap are all new. I think that there was a definite change with a junkyard mass air meter, but it still does not run like it did before it messed up saturday night. Please help!!!!