96 Tracker runs like crap

[prnitz]

Bought a 96 standard tracker five speed 1.6 L as a project to refurb with my son. It's had a full tune up, seafoam treatment in the oil, gas and intake. I replaced the throttle position sensor, and mass air flow sensor twice actually, new fuel filter, and maybe some other stuff I'm forgetting. It will run at high RPMs but when you put in the clutch and come to a stop sign it will either die or just sit there barely running. Once you get the RPMs back up again you can move in first second and third gear, not as well as they should run but okay I guess, once you put it in 4th it starts decelerating and in 5th it will barely run. But if you're just sitting still and letting it idle up at its own pace you can gently keep giving it more gas and it will go up to 7,000 RPMs and seems like the motor is strong. I'm not a mechanic but it's been in a local shop here with very experienced mechanics multiple times with a lot of money invested and we're not making any real progress. Does this sound familiar to anyone? I'm not sure how this forum works but if you have any experience with what I'm dealing with and would like to contact me my email address is [email protected]. thx, prnitz