no power at low rpm
 

hi i just bought this truck 1993 mada b2600 4x4 5spd it had a blown muffler when i bought it had it fixed when i let it idle for too long it starts runnig rough then when u give it gas its like its flooded u have to play with tthe gas pedal to get it to run right

it does this at low rpm's and i can barely use 5th gear on the highway
everytime i shift gears till the rpm's crank up a lil i have no power

any help would be appreciated i know its probly not a big ting but just dont wanna replace good parts cause some of em are expensive

thankx for reading any help would be appreciated

RE: no power at low rpm
 

it kinda feels like an o2 sensor in wasy but in other wasy it dosnt any help appreciated