86 5.0L

alright, I spent most of the day driving around, early in the day, there was a small dead spot around 1500 RPMs where the car would give a tiny buck, in all gears. Ok, couple hours later the bucking is getting worse around 1300-1800 RPMS AND the smell of raw fuel is getting intense(I have a small exhaust leak at the header-midpipe connection) and just now I was driving home and the car is bucking and misfiring at ALL RPMS, I am enveloped in fuel vapor and have to keep it at 2000 RPMS just to keep it from flooding(from idle to 2000 RPMS and feels like a flooded carb) bucking HARD and stalling, I get home, park, rev in neutral and there are no misfires happens only under load. The tailpipes are bellowing dark smoke(not sure the color, it's night), I pop the hood and have my extinguisher ready, check the fuel lines, they're fine, fuel smell is barely noticable, nothing out of the ordinary,

going to drop it off with my grandpa and dad tomorrow to look it over since I have school in the morning. Im sure the ECU went into limp mode, leading me to think its the O2 sensors.

Its a stock 86 5.0L
new fuel filter
new fuel pump
new wires
new plugs

cleanfitty

Sounds like the FPR possibly took a crap..

Shelty

I'd start with the o2 sensors... how old are they?

try the TPS as well, my car would give me hell at every RPM... replaced it, car is running perfectly now

86 5.0L

im still stuck here at school, car hasnt been looked over =/

I was thinking the FPR took a dump, but also I had one new o2 sensor and one unknown(was on the car, could possibly be the original)

mjr46

run a koer/cylinder balance test and see if any codes come up that'd lead you to a problem area

86 5.0L

turns out it was a vacuum leak under the intake, atleast thats what the mechanic said( i know i know, but i didnt have the time to do it myself) he had just left after I got there so I have no idea what he saw/tested/did