1974 Other Chevrolet Models wont go up hill

1974 CHEVROLET
150,000 MILES • V8 • 4WD • AUTOMATIC
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525SAMMI
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my truck will drive just fine on flat ground but when I go up hill it slows down to almost a stop no matter how much gas you give it
May 11, 2009 at 4:27 PM
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HMAC300
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your exaust pipe may have collapsed . a vacuum guage reading of less thatn 15' wil note this. try disconnecting the exaust just behind the down pipe.
Oct 5, 2009 at 8:58 PM