2000 gmc safari bucking at part throttle

[lone racer]

about a month ago wife had a issue in wet/slushy condition van started misfiring and staled but after a few minutes started,when I got home pulled the dog house noticed the coil wire half off and figured she had 80k on it since we got it and did a new coil,wires,plugs,cap,rotor also fuel filter. No issues till sat night it did the same thing except it backfired when she tried restarting it. It now has a bucking(I don't think ignition break up) it is a erky jerky/ smooth-rough-smooth-rough etc.. when normal driving off idle and a slight bucking at speed. If I dog on it no bucking. fuel pressure guage shows good even when it dose it, haven't found a vacuum leak nor a ignition arching issue. no cel
so many possibilities I started pulling maf plug( it ran better but not 100%) no cel. With maf pluged in pulled tps,crank position sensor and iac and nothing happened at all no cel no change in bucking.
scanner is showing 99.2 stft b2, tps .004 or.04 at idle and barely jumping to .0/.007 for a sec when playing with throttle then settles back to the 4.
I can not interpret what the scanner is telling me, and without a good one and ability to understand it mine will do me more harm than good I think.

With almost 200k should I start with possible dizzy gear being worn, ecm,maf,iac,ETC..r2d2,pms lol.
I really cant just throw money at it in hopes
If you are able to scan and near me I can drive to you and compensate.
If you know any thing im ears.

[mikesfastss]

Get a brand new distributor and be done, not a junk yard one. I’ve been down this road with a 01 s10 blazer, they have moisture issues or the screws are loose on the rotor or the body is cracked by the cap screws( plastic housing).

[Beigg]

4.3?

whats the fuel psi readout at rail?

[1BADAIR]

02 readings? If it runs at wot without issue then check them. They are not used at wot

[lone racer]

4.3
engine off key on = 60 psi
running = 60 psi
during buck session = 60 psi
engine off pressure maintained 60 psi, bled off pressure key off then on = instant 60 psi maintained 58+ while running and bleading off.

[lone racer]

I will grab scanner and check recorded data on the o2s

[AutoRoc]

can you see the MAF wires inside the housing? May be broken. My old iroc had same symptoms with broken maf wire(old style maf with long wires in it)

[lone racer]

attempting to print data

[lone racer]

when I cleaned it with 16 dollar maf cleaner I made sure none visually

[Beigg]

A long while back had a Jimmy that ran like you described. Fuel PSI was no more than 5 psi less than what it should have been. Even during duck season. Changed the fuel filter & pump, it ran as it should... Guzzling fuel without even one-wheel peeling...it couldn't burn the rubber even when new!