575sci running rough
 

Running real rough and rich. Will idle and stall. Can't get on plane. I see fuel in mechanical fuel pump vent line to back of carb so installed a new one. Same thing so changed tps sensor ,same thing. I'm lost and need some expert help.
Thanks

If you could buy or borrow a Rinda or other scan tool, you would be better off than just guessing. Check the plugs, they may be fouled due to the fuel pump failure.

sounds like your injectors may be leaking.
I'd test first,fuel pressure and then w/ key on,engine not running,see if the injectors are holding fuel.then start engine an look at the spray pattern.after that,get a scan tool on it.how old is the gas?and when was the last time cap and rotor,wires been changed?

They run mechanical fuel pump on injector sc engines?

Cap and rotor new, changed fuel regulator today and now won't start.

Did you ck fuel pressure

Idle air control sensors. Does that have lAC sensors? Also read an older thread where the high pressure fuel pump to the cool fuel system wasn't working. Is it possible your spider fuel injection is cracked and something funky going on with it.

Fuel tank vent? That typically would starv for fuel so probably unlikely but thought I'd throw it out there anyway.

Fuel pressure should be good now with new regulator. Going to install new ignition coil, pick up coil, plugs wires and temp sensor and hope for the best. Only thing left after that is map sensor or ecu

There are a lot more things that can be left. Check the basics first. Put a scanner on it, check the fuel pressure, make sure the injectors aren't dumping fuel , give it a tune up and do a leak down test on it. You will find the problem . No need in just throwing parts at it

Chances of the coil or pickup coil being bad are pretty slim if the engine will start and run