[tooltimetech]

With this fuel system fuel pressure is very important to over come the poppet nozzles in the fuel injectors. If the fuel pressure drops below the poppet nozzle threshold the injector will not flow any fuel, (if fuel pressure is even as high as 45-50 PSI it will not run, usually takes 50-52 PSI to open the poppet nozzles) that is why fuel pressure and fuel volume are so critical. Under heavy load (driving at highway speeds up a hill or under heavy acceleration) the fuel system is being asked to work it's hardest, if there is a weak component that is when it will show up. Check fuel pump volume, fuel pressure regulator, and fuel system's ability to maintain fuel pressure when shut off. If your system does not maintain fuel pressure when shut down or the pump volume is low it should miss under heavy accel. or going up hills at highway speed. After verifying the fuel supply system make sure the injectors are clean. (In the range of $100.00 around here.) $474 wow is that all that was done is clean the injectors? I really like this fuel system, it is just not understood by most because it does not react like all the other electronic fuel injection systems. Last but not least make sure the spark plugs and wires are fine, and yes I prefer OEM. Hope it helps.