1988 Buick riviera 3.8

So my car has ran pretty damn good, I’ve been trying to keep up on repairs if anything happens, but lately i’m dumbfounded, few days ago i was driving home from a job interview, i was at a red light, the car started idling REALLY rough, not even just shaking but thumping etc, after about 30 seconds of that, the car shut off…i was in the middle of full traffic (what fun) so i had to get out, push my car into a parking lot, and i attempted to start it, wouldn’t turn over, just kept running REALLY rough banging and shutting back off, so i called AAA got it home, and now..it’s starting and running, but still pretty rough? i had a buddy come over with a diagnostics tool, and it said it was the camshaft position sensor, so i went to napa and got a new one, threw it in, and still isn’t running properly? i looked up and the symptoms sound like a bad MAF people said, so i took it off and got some MAF cleaner, cleaned it really good and put it back in, no change at all, so confused and have no idea what else to do, i went out lat night and hooked a jumper wire to the connector and wrote down the codes, looked em up, and it’s saying bad camshaft sensor AGAIN? is it possible i got a bad part? or do you think it’s the MAF? or something else? i’m out of options, and i don’t have the money to take it to the garage, closest garage is wanting 150$ just to inspect, any suggestions would be amazing.

Thanks in advance!

side note:i have the CRT monitor in the center dash, gives basic diagnostics, it’s just saying electrical problem detected, i’ve put new plugs, wires, and a new ignition coil in it, not sure what else to do!

also ANOTHER side note i noticed today, it seems fine if i stay under 50? it still idles rough but no shut off, so i took it down a main street, and it seems once i go passed 50, and i started slowing down to in-town speed, is when it starts acting up, and also jerking the car a bit!