20 Most Recent 2011 Chevrolet Silverado 1500 - Page 9 Questions & Answers

You may be losing fuel pressure or have a hard fault in the electronics of the engine control system. Do this, have the fuel pressure checked and have a fault code test run on the computer system. If all is ok then the ignition starter switch is suspect as well and the MAF sensor which will not set a fault when it fails.

Start it up and it might then

If you havent rebuilt the throttle body ,that would be my suggestion

Blown head gasket.

If the controller uses a SCR to switch the power on to the trailer brakes there can be some low voltage leakage across it. If you measure the amperage I would guess it's milliamps.

check the firing order of the HT leads as it is easy to cross 2 leads the timing is set at 12 degrees btdc and no where else so use a timing light and set it there

Have you checked/changed the engine temp sensor for the computer on the engine?,not the one for the dash gauge. The temp sensor can really affect fuel mixture as does the map sensor(make sure it's getting good vacuum) and as do the oxygen sensors.

I can't look up your wiring diagram because I don't know model year? On some makes and models, the lower brake lites are wired through the multifunction switch. Your turn and stop use the same bulb filament, just not at the same time. On a left turn, the left turn signal works, but the brake lite on the left doesn't. Now, the brake lamp on the right does work. The high mount brake lite also will work. The highmount brake lite is usually wired differently than the lower brake lites. W/o being able to look at wiring diagram, I don't know if my info is applicable on your vehicle? I need model year.

probably a bad earth or a faulty bulb. remove the tail lights, remove the tail bulbs one at a time and test, then do the same with the other bulbs.

If after checking the bulbs are ok then the fuses could be suspect!