95 gmc jimmy 4.3L side mount spark plug wires not running well.?

andy b

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just changed out the motor. ran fine for about 30 miles, then started to cut out. i was guessing plugs or plug wires but check engine light came up with map sensor, maf sensor, or vacuum hose leak. all hoses seem ok. engine idles great and runs good for the most part but when it cuts out it cuts out bad and it's always when i'm giving it gas. what's most likely wrong?
 
my guess is to check the two fuel lines inside the intake manifold. going to the SFI there plastic.
 


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