losing power?

[tinlizzy]

I have a 96 with 306,000 miles on it. Engine never been rebuilt, new injectors at about 240,000, DIY intake, 3" down pipe and 4" exhaust, edge EZF1000. It seems like I have been slowly losing power over the last year. I pull a 6000# trailer daily, and its not pulling up mountain hills as good as it used too. Any thoughts as to what it may be? And also when I put the chip above setting 2 it sputters going up hill like its running out of fuel.

[tinlizzy]

anybody? bump

[dwarfcar63v]

have you checked your fuel filter? i had a simular problem that ended up being the lift pump in the valley between the heads

[Aaron Dickinson]

we had this problem...ended up being a bad thermostat.

[tinlizzy]

fuel filter good, Ill check out these other things thanks

[Stinkers]

This sounds very similar to the problem I am currently having. It does the same thing with the chip and stumbles on anything over the second setting. I've been trying to chase it down for about six months now with no real luck.....I hope someone can help.

[Dave]

check fuel pressure. I bet the fuel pump and or HPOP are getting weak at that mileage

[tinlizzy]

stinkers, I will let you know what i find out. I change fuel filter on regular bases so dont think thats it, but changed it and t stat today. Proly gonna stop by a shop tomorrow to have fuel pressure checked.

[Stinkers]

Thanks tinlizzy, I would really appreciate it. I changed the fuel filter today and cleaned out the fuel pressure regulator and it didn't make a difference on my truck. My fuel pressure at idle is good but I have no way of testing it under load.....but it has been a sneaking suspicion of mine that maybe it is crashing under load.

[tinlizzy]

Stinkers, how many miles on yer truck?