1994 Toyota Avensis idling

1994 TOYOTA AVENSIS
120,000 MILES
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PHYLIPHERM
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Repect to you guys.
my truck makes a hissing sound when i'm accelerating and looses power going up incline. i tuned it up and had he muffuler system checked out.i even double checked the timing . it sounds like normal except for when driving. it also burns more fuel than before. the only thing i didn't do was checked the compression.
please give me your opinion,i've had this truck for about six years and never had this much problem with it.
Thanks
Jul 23, 2013 at 5:37 AM
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HMAC300
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scan for codes andcheck fuelpressure first, then check for a vacuum leak, cracked/broken hoses etc.
Jul 23, 2013 at 5:42 AM
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PHYLIPHERM
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Thanks Mr Troy, i tried that too and changed the fuel filter as well. maybe i missed something so i'll go over it again.
by the way its a toyota 4runner 4x4 3.0 [sr5 ]
Jul 23, 2013 at 6:06 AM
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HMAC300
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burning more fuel may mean something is screwed up in computer running. what is fuel pressure in psi should be 38-44 psi with a wire jumped between B+ and FP key on engine not running
Jul 23, 2013 at 6:26 AM