VN SS engine deteriorating quickly

[Big_cheese69]

Hi everyone my engine has been getting worse
It first became less responsive, then slight misfire
then it would only idle if u gave it any throttle it
would die now it won't start, I've

checked for error codes, changed fuel filter, checked
spark on each cylinder, checked injector pulse, checked
operating voltage of map/tps sensors, fuel pump is
operating The engine sounds like it wants to start going
to check compression and fuel pressure now.. Any help
would be appreciated!!

[greenfoam]

One fuel pump might be spinning but those things have two pumps and you need both running 100%

[GenReaper]

do those things run a fuel pressure regulator?

If so could also be dodgey.

[Big_cheese69]

I'm borrowing a fuel gauge in the next few days if I get a reading
between 45-55psi this would meen the pumps are working ok yea?
Thanks for the help

[Big_cheese69]

Would u know how to test the reg?

[Vlad01]

if the pressure is pretty consistent then its working fine.

[voxbox]

I know you said you looked at the TPS, but i'd also check it in a full-sweep, not just when it's in it's idle position(if you haven't already done so). Had a similar problem on a previous car - would idle fine, but the moment you thought about breathing on the throttle, it would stall. It would read fine when the throttle was closed, but the moment it was even a fraction off, the readings went all over the place, and the ecu would give up and move somewhere warmer for winter.