Corvette: Help needed- C5 Corvette stumbles under load <1500 RPM

OK I'm gettin desperate but have a 98 Coupe MN6 and its been acting
funny lately. If the motor is under load (up hill or high gear) and it
is under 1500 RPM, and I press the gas more then 50% of the way the
car stumbles.

I first noticed this when I did the "zip tie airbox" mod. At first, I
forgot to plug the little vaccuum line thingy into the accordian
coupler in the intake track. Now- I did drive around for about 20
miles with this error in place. I figure oops, no big deal I'll just
plug it back into place. I plugged it back into place, but it still
does it. Then I replaced the entire airbox assembly and even reset the
battery. Its still there. Oh yeah, I did try to pull codes, there was
nothing. Zero.

Yes I've checked over it to make sure theres no air leaks in the
intake track. I even pulled off the MAF and filled the intake plenum
with water to make sure of no leaks. I'm 98% sure that theres no
airleaks but I'm a little skeptical of area between the duct that goes
over the radiator with the flag on it and the flexible accordian
coupler. It sorta just pops on. I'm probbly gonna seal it with sealer.
I also tried undoing that plug that goes into the accordian coupler
and sealing it with tape but once again no luck. Maybe my MAF went
bad?
Dont think I have bad fuel, i've already filled up once and dumped
some techron in there too.


Any other suggestions???

LOL

Ev