190e 4cyl has no more power past 1/4 throttle
 

i have a '92 190e 2.3
160,000

when i drive it at 1/4 throttle or so, it drives normally as it should. but if i floor it, there is no more power, often less. this is especially apparent form a standing start. if i just floor it, even on gravel, it wont spin the tires. if i give it a 1/4 or so, it will spin on gravel and on tarmac will just drive normally. revving in neutral, the car revs faster part throttle, than full.

so far ive run techron in the gas, seafoam through intake, then changed plugs and fuel filter. the car has no cat. i also adjusted the transmission cable so it has almost no slack. there are no lights on the dashboard.

im assuming i may have to start checking out fuel injection parts? egr? it appears to have 2 fuel pumps, could one be bad?