1994 Acura Integra Preformance

Hi There,

Okay this is sort of hard and I don't know how to put it all in writing but here it goes (it's going be a little long).

I have a 1994 Acura Integra LS. This car was really good and when I bought it. However, there was a dent in the gas tank so I had to replace it because the indicator wouldn't give me the accurate rating because the dent was exactly where the indicator was. Anyway, the problem with this car is pulling and starting when it's below half mark on the gas indicator. For some reason when I press on the gas peddle this car doesn't pull as fast as it should. Also, when I'm driving I noticed that when I go over 80Khm this car starts shaking and feels like it wants to blow up. I think I do have a problem with transmission but I don't know if this is what's causing it. Ever since I changed the gas tank I've had a problem where the indicator on the gas tank is below half it takes a few tries before the car starts, I could hear the engine turn over a couple of times but car doesn't start right away. Lately when stopping for a red light or on idle this car starts shaking as if it's going to shut down but all the sudden feels like something hovers over it and it comes back to life. Last month when I was driving the car it turned off on me in the high way a few times. My suspicions would be Converter, Vacuum or the fuel pump but I might be wrong in all those. I don't want to replace my transmission unless I really have to because sometimes at the odd times I feel as if the car performance is excellent just like a brand new car. I also noticed that in good none humid or cold weather this car runs perfect and sometimes when it's the opposite the transmission doesn't kick in on time and feels like the car is breathing hard for the transmission to change gears. Feels as if the transmission has a mind of it's own it will not shift down and up on time have to either break hard or press on the gas to get a response. Kind of difficult to describe the symptoms but I hope this helps. I would really reallllllyyyyyy appreciate your help so much! I don't have any check engine light on so it's kind of hard to diagnose on the computer and I don't just want to replace parts randomly. Would you also think that it could be a sensor thing? I have a feeling that it's just one problem that's cause this whole dilemma.

Thanks !