[Monty.Starkey]

Hey guys , gotta pick your brains since I'm stumped. I have a dodge B300 sportsman RV with the 360 in it. It currently runs very very rough, like shaking and making hellacious noises. However at idle it's smooth, but will die unless i can keep it chugging along till it's warmed up. I would assume a misfire but it would have to be half the engine for this kinda noise. I've replaced the plug wires, plugs, distributor cap, rotor and have checked the vacuum when it does idle smooth. It sits at around 18Hg till it starts shaking and being really rough then it's erratic..like the rpms. The timing is at TDC as per the valve cover and once it dies, it takes a monumental effort to get it running again. Since I've ruled out vaccum could fuel pressure do this? I'm unsure of the current pump . Or would the carb be creating an odd fueling scenario since it's been about 6 years since I last rebuilt it.

Is there anything with this information that one of you could create a possible issue? I'm having troubles finding info on this type of engine behavior.

It's a bone stock 360 with the Holley 2 barrel up top.

Thank you all very much for any information provided.

 

[Monty.Starkey]

Even at warm up it is erratic beyond idle, The choke seems to be functioning properly. Would any of those things create a very monstrous misfire that shudders the whole engine ? Even with the carb bowls filled and the carb squirting down both sides evenly it shudders like you would not believe ( or would ). But I will look into rebuilding the carb as I already have the kit, and i was planning on an electric pump. See where this takes me. The distributor has very small amounts of play on it. It doesn't so much sputter , itshake and feel like it's firing on half the cylinders, unless it get it to idle, then its smooth no noises.

 

[Monty.Starkey]

Thanks guys I'll have to check and see those options. I'll get back with more updated info.

 

[Monty.Starkey]

Well narrowed it down to my Vacuum advance, now this is odd. If i remove my vacuum advance and plug it off the engine runs great, no mid range power of course . If i re install my Vacuum it goes straight to hell. The diaphram is holding just fine and if i pull the dist. cap off i can create enough vacuum with my mightyvac to advance it. My question is, what does this mean? i seriously seem to be missing something here if a good working diaphram and advance mechanism is screwing up my engine so bad it sounds like the worst misfire ever.

Off topic, is there supposed to be a return spring on the brake pedal?

 

[Monty.Starkey]

Hose is good but I'll change over ports, see what happens I'm certain that's the only thing I didn't check lol

 

[Monty.Starkey]

Well both ports on the holley 2bbl are pulling manifold vacuum so I'm gonna check into that after a bit. However back to the brake pedal, it's very very stiff and difficult to push in or pull so i tore it down to just the swing arm and it alone is causing issues. Does anyone know a good way to remove it completely? I've removed the nut on the side but i cant seem to tap it out any direction. I've soaked it in lubricant in case it's just rusted but still seems to be very very hard to push. Any suggestions? And i honestly appreciate all the inputs, this knowledge is good to keep passing on.