I have a 2004 chevy suburban awd. When your are stopped and press the acclerator to the floor it barely goes (it moves just very sluggish) maybe 5-8 seconds before it will accelerate normally, seems to be worse when it is hot. Unpluuged map sensor same or worse please help. Thank You It almost seem like a 2 stroke with a powerband all or nothing

 

when was the last tune-up?

 

last year, once it opens up an goes it runs great just very slow to approx 20 mph

 

Welcome to the forum.

Had an '87 IROC that did the same thing and it was the fuel pump.

 

make sure you check your fuel pump pressure. when you did the tune up did you put a new fuel filter on? Have you scaned for code?