I have a 2003 suburban that has me stumped! I was on the freeway and it lost power (foot on the accelerator and it wouldn't go!), I limped it to an Auto Zone to scan it and it said maf sensor and map sensor and random misfire. I changed both sensors with no positive results. I limped the truck home and since have changed spark plugs, wires, fuel pressure regulator, fuel filter, fuel pump, I have checked the coils, intake manifold gasket, injectors, fuel relay, O2 sensors, catalytic convertors and air filter. Please help!

Hello, Have a look at your Crankshaft and Camshaft sensors. As I remember there was a problem on some Chevies with the Crank sensor and it caused a different problem with the timing. But it probably could cause more problems so its' suspect.

While you did the filter and Regulator for the fuel, did you do a fuel sample? Also some of the ECU's can be refreshed and it is possible that you lost some info in the main computer and just need a reload of the program.

Although you changed the Intake manifold gasket, did you do a Vacuum check or mist the Vacuum lines while the engine ran? You should see if the Vacuum reading is okay. Then see if there is a Vacuum leak somewhere.

I hope my solution is very helpful to you. It looks like you spent quite a bit to solve this.