If you hear a pop sound under the hood when you accelerate it is most likely running lean (Not enough fuel) from either a vacuum leak or the fuel pump failing (low fuel pressure). Be sure to use a wrench on the pipe and a wrench on the valve or the pipe will twist and break and sometimes a torch is required. Cost about $18.00 each you should replace both if they are the problem.
The air injection check valves (STANDARD MOTOR PRODUCTS PT#AV7) are common failure parts. If it backfires when you let off the gas peddle it has air getting into the exhaust, either an exhaust gasket or cracked manifold before the catalytic converter or the emission control's Air Injection system.
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