× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
1977 Chevrolet P30 Step-Van 4.8L Mechanical
Posted to GM Engine on 4/5/2012 65 Replies

starts easy, idles slightly rough, "pops" through carb as rpm is increased, vacuum drops just like a plugged exhaust (no CAT).

Dropped the exhaust at the manifold and no change - still pops and vacuum drops (snaps back to 20) like a plugged exhaust.

tried to...

65 Replies Received (View Replies)

  Related Documents & Media  1977 Chevrolet P30 Step-Van

 
Message Closed w/Summary

car Vehicle Data

1977 Chevrolet P30 Step-Van

VIN [No VIN Available]
Engine4.8 L / 6 cyl / GAS
Trans4-speed Standard
DeliveryCarburetion
Message Closed w/Summary

car Vehicle Data

1977 Chevrolet P30 Step-Van

VIN [No VIN Available]
Engine4.8 L / 6 cyl / GAS
Trans4-speed Standard
DeliveryCarburetion