Well after posting earlier about my vacuum routing, which ended up being correct, I have an issue I can't locate . I have very low power under around 1100 RPMs (no tach). When I try to take off at any lower RPMs the engine dies. Though when I am running down the road I have tons of power and can even do 70 mph just fine. Of course, in 4whl low it drives great off idle. Specs: 10 degrees advanced (on the bb) Carb fuel mixture adjusted to highest vacuum at gauge (16 in/mg with a 1in. fluctuation) Mods that may cause problem: Downey Torquer Camshaft Holley 350 Port/Polished Head Tri-Y headers All Smog comp. removed Fully Rebuilt Engine, Trans, T/C w/ all new bearings, seals, clutch assy., wiring harness, blah, blah,blah. Crane Ignition Module PS conversion Crane Oil-Filled HO Coil 38.5x15 Swamper Boggers Basically I have rebuilt everything on the cruiser. I am wondering whether the tires are too big for factory gearing (4.11:1) and power of the engine? even though I have all these power increasing mods? or- Any other comments. Thanks for your help everyone . ps- I also thought it may be a locking up wheel (rear is fully locked, front aussie, 4whl disc brakes) causing a tough to move vehicle but I can push it just fine. Oh, and thanks again .