I have a 13b engine with the Rotary performance intake and dual Weber 36 DCD carbs. I have rebuilt the carbs and it won't idle correctly and the intermediate range throttle stumbles, etc. when everything is hooked up. When I disconnect the brake assist hose from the side of the intake, the idle smooths out and runs a lot better. Only problem is that the brakes don't work too well that way. I've seen a few posts from folks with this setup, but mainly that they've encountered problems that they have problems curing. Any suggestions???

 

#1 its not r.p. its rotary enginering (sp) you might have a vac. leak on the main shafts. a friend of mine has this same prob. and thats his deal.

 

You might check the diaphram in the brake booster. It probably has a hole in it. A big vacuum leak.Rob