1998 Chevrolet Silverado 7 4 Engine Put 51 Pu Runs Fine Blocks Cuts Down 4

1998 CHEVROLET SILVERADO
135 MILES
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JOHNBONDS
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7.4 engine put in 51 pu runs fine for a few blocks then cuts down like 4 cylenders shut down then sometimes goes back to running smooth. any ideas?
Nov 10, 2012 at 4:12 PM
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HMAC300
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scan for codes and check fuel pressure first.
Nov 10, 2012 at 4:14 PM
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JOHNBONDS
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no codes pressure 58 lbs
Nov 10, 2012 at 4:18 PM
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HMAC300
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ok now check for vacuum leakstry tightening the intake manifold up especially if this has the 6mm bolts holding it. you can use choke cleaner to help to try find vacuum leak.
Nov 10, 2012 at 4:28 PM
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