Hi my name is Gary, I have a 1994 Chevy camaro with a 5.7L v8 automatic. I have an issue where the engine has no power and it backfires at high RPM and shakes a little when at a light. Parts I have changed: coil, optispark, spark plugs, fuel filter. A mechanic told me my "right bank was running rich" but said my o2 sensors are working fine. It would be great if you guys could help me. I love this car and would hate to get rid of it.