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yes was able to clear the codes, but same problem

OBDII connector

I need some help. I have a 2004 Chevy colorado 4 cyl. base model. I am throwing code P0449 Evap emissions control system vent valve/sol malfunction. I changed the canister vent valve and cleared the code. I drove the truck to work (52 miles) without shutting the truck off and the code didn't...

the alt made your needle bounce around, but did your vehicle spit and sputter and run bad?

I will try unplugging optical sensor, hopefully thats the problem

when it's all warmed up at idle she runs fine, when I raise the rps to about 2500 or so she starts spitting and sputtering like crazy, when I let off the accelerator she's fine. took her out today and she acted up, especially going up a small incline, started sputtering and choking, and blowing...

shit I hope not.. how can I check that

what about the vehicle speed sensor, or the map sensor?

grounds seem to be ok, I guess possibly alternator. It is actual engine rpms

:mad2: Well... I just can't seem to get this truck running right. She idles fine and cruises good, but when I get up to about 50 or 55 mph and 2000 rpm the tach needle starts going nuts like someone is feathering the pedal, then the tach drops to nothing like I took my foot off the pedal, but...

I have changed the lift pump twice, im sure that it's installed correctly, have changed the ops and the fuse(the one you can jump to keep the lift pump pumping) Don't have a voltage meter and not sure I would know how to work one if I did. where is the water drain?

i'm pulling out the ffm tomorrow to check for anything.

blew it out with a air pressure line. don't think ice, does it cold or warm. what is the barb on the inlet of the FFM?

yes

Well here I am again begging for help, just can't seem to get it right. I blew out the fuel line from the engine side of lift pump to the fuel filter. Now I can't keep fuel in the fuel housing, it pumps up to the filter, and only runs until the fuel housing is empty. did I possibly blow...

Thanks guys. the lines from fuel tank to lift pump are new since Aug of this year, also the float in tank assembly. Hey Turbine Doc thanks for all the great help. took truck out tonight, no sputtering or bucking, but I did notice a decrease in power

does my truck have a mass air flow sensor? I put in a new lift pump this morning, and the truck still sounds like its getting air in the lines

ok guys i thought i already sent this. I went out to check pressure of lift pump this morning. I started the truck to let it warm up, then I put on gauge and opened the t-handle, Nothing came out. I took off gauge with truck still running and t-handle open and still nothing. I closed t-handle...

thinking that way myself. got a gauge yesterday, going to check it now

should fuel come out even with the truck ideling? or it won't come out the bleed screw because fuel is being sucked into the IP?