What is causing power loss?
Have you checked your fuel pressure ?
Reason I asked if you checked fuel pressure is because it does vary from load to just ideling if it is going bad..... and you right away told me you had a mechanic check it, so I figured your mechaanic would of checked it under a load going down the road, sorry about your $500. bill , Have a Good day !
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SOURCE: HARD TO START WHEN COLD AND WHEN IT DOES IDLES BAD AND STALLS.
Try replacing the ignition control module it is located under the distributor cap Cost is around $30.
SOURCE: 1995 gmc 4x4 tbi/1/2 ton
I had a problem with the brakes on my 2005 GMC that significantly increased the fuel consumption. The calipers for the disk brakes were not moving freely and were causing the brake pad on one side to always contact the rotor. This problem is easily found by checking for heated brakes after a short drive or by coasting to a stop to see if the truck rolls easily without power.
SOURCE: 1996 GMC K1500 Pickup Starting Problem
i would try a fuel filter first. the fuel gauge going crazy is most likely the sender they go bad and eventually stop working. the bummer is you have to replace the fuel module. these aftermarket are about 200 bucks. the module comes with the pump and sender which is the next part you want to look at. gm has some issues with the harness to the fuel pump externaly. it actualy will melt and start to lose conection. i would check this by visualy inspecting the plug on top of the tank. unplug it and take a look. if it is at all disscolored replace the pump (module). the new pump comes with a replacement harness (make sure its in the box)hope this helps and good luck
SOURCE: topkick cat 3116 wont start
Check your fusible links; these are small wires molded into the middle of a bigger wire they are usually located up by the battery cables. When they burn they become discolored and softly flexible. Also check your relays too.
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Yes, the fuel pressure was checked by a mechanic and it was ok and all codes were within specs.
what engine do you have
This site did not help me but I did get the problem fixed. It turned out to be the fuel pump. Only detectable under stress. $500.00 later. The fuel pump only failed under stress. They had to crimp the line while on the computer to diagnose. Thanks anyway. I hope that this helps someone else. Contrary to popular opinion, the fuel pump can go out gradually.
at high rpm engine breaks up starves for fuel
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