1994 GMC Vandura 3500 Q&A
1994 GMC Vandura 3500 Question: wha is the timing?
when i goin the the hiway and is an slope , the speed go down drasticly from 65 to 35 mph., lus power.. - Visitor
sounds like a clogged cat converter. take it to a shop for a check to verify and a bid for repair. Roy - mastertech6371