ok so i have a 92 blazer tahoe lt 4dr 4.3 auto

first off it runs really good slight miss or something at idle exhaust is quite black after starting truck and give it a rev there is a blasck spot on the ground under tailpipe

when taking off from stop light when i push the gas there is a split second when hitting gas that it doesnt do anything then suddenly it just goes
intermitent service engine light not always
has lack of power when climbing hills like when on freeway i can be doing 120k and hit a hill and it slows me down to like 90 or less

i have just replaced the map sensor in it seemed to help alittle with the engine light not staying on constantly
but still runs rich and lack of power still there temp stays good oil pressure stays good
i just dont know what to do from here
any insight would be greatly appreciated thank you

 

ok so i ran the codes got a 44 and 45

 

These are both O2 sensor codes. I would check over the wiring. If you haven't ever had to mess with the O2 sensor before, it may be time to replace it.

 

oki took filter out and checked it was pretty much plugged so i just shook hell out of it bunch of crap came out ran gas through it as parts store to far for now will change later

then drove again and rechecked codes now only have code 45 so i am thinking o2 or cat i get a stinky smell from exhaust but running reallly rich