I need to know how to check fuel injectors. I've been having a really bad problem with loss of acceleration when flooring the accelerator. I just had alot of work done to it ( such as timing belts; throttle body w/sensor; sparkplugs and wires; fuel filter; fuel pressure regulator; distributor cap & rotor and the list goes on. The only thing I haven't tried is oxygen sensor; fuel injectors.I seriously need help with this. Someone help.