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Express van runs rough under load??

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Old July 4th, 2013, 2:44 PM
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Default Express van runs rough under load??

Hi! Happy 4th!!! This is what I'm working on. I had a small leak in my manifold so i just replaced the intake manifold gasket. I unassembled/reassembled everything without any problems or broken parts. My problem now is the van starts, idles, and revs great; but only in PARK or NEUTRAL. Every other gear which puts a load on the engine makes it run rough and no power?? The van was driving fine before I took it apart, just had the leak.
Year - 2000
Model - Chevrolet express 2500 5.7L
Miles - 160,000. I purchased it with 135,000 2.5 years ago.
New spark plugs, and wires about 2years ago
New radiator about 1 year ago
New fuel pump assembly and filter about 6 months ago
Attached Thumbnails Express van runs rough under load??-image-3305159202.jpg   Express van runs rough under load??-image-1852628527.jpg   Express van runs rough under load??-image-1186459737.jpg   Express van runs rough under load??-image-2510253933.jpg  
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