View Full Version : Idle trubleshooting Prostar 190

07-22-2012, 01:51 AM
I have a 95` Prostar 190 with a Marin Power Chevrolet 350 EFI. When I give it a full trottle, the engine seems to hesitate and stumble before reaching high rpms. After a while it seems to run smooth and normal, but it takes some time before this happens. All filters and both fuel pumps on the engine are new. However the owner i bought it from seems to have replaced the original high pressiure fuel pump (with a return outlet to the gasoline tank) to a pump with only only one inlet and one outlet. Having red the repair manual I understand that it is supposed to be a connection between the fuel pump outlet and the fuel tank. The return hose on the fuel tank is simply plunged. The issue in this case is, does this affect the slow idle, or is this simply a problem that can be solved by tuning up the distributor?
Here in Norway there are no Mastercraft dealer an few skilled technichians on EFI engines.
I would be really happy if anyone could help me out with this problem!