Stumbles And Stalls

[ken4d]

Engine Performance problem

1987 GMC Suburban V8 Two Wheel Drive Automatic

 

Just purchased an 87 Sierra 1500 350 ran fine 4 two weeks then started running ruff and stalling @ operating Temp hooked a scanner to it got codes 33 (map sense High)and 45( Exhaust Rich) I replaced map solenoid and map sensor this seemed to make things worse now it runs bad (sputtering like only on 3 or 4 cylnders and dies everytime immediatly and picked up a new prob its hard starting now i have to pump and hold gas pedal to start any suggegstion would be appreciated

[2COR517]

If it ran OK when cold, then started running poorly when it warmed up, it's like the coolant temp sensor. That could be causing the rich condition.

 

Pumping the pedal does nothing on EFI.

[ken4d]

so replacing coolant temp sensor would that also fix the recently added starting issue