1994 S-10, 4.3 Vortex, jumps from OD to Dir. while driving, also while sitting in park will surge about 400 RPM'S, up and down.
Jul 11, 2011 at 1:48 PM
S-10
BILLY12
- MEMBER
- 2 POSTS
Advertisement
The surging is typically due to a vacuum leak. When the engine is still cold, use a spray bottle to squirt water on the vacuum hoses and intake manifold gaskets. If you see the water get sucked in or you notice a drop in engine speed, look closer in the area you're spraying.
Jul 11, 2011 at 2:09 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement
parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.