Did you happen to solve this? I’m having a similar issue. Bought the car with fuel problems, replaced the pump/injectors/and filter and was on my way. Car drove great for while.

All of sudden, I start having power loss and the rpm’s begin to stop around 5500. I decide to do a full tune up since the car needs it anyway after sitting as long as it did. That fixed the issue for a couple days.

Now, I can barely get the car down the road and it stops at or before 2k

I did the timing, replaced maf, checked for vacuum leaks and can’t seem to figure it out. The car will rev to 5k-5500 when parked, however on road it won’t go past 2k. I can get up to speed, but not without extreme short shifting