Having problems with my car, NEED HELP!!

[4.6 Rocket]

Right now I have three problems with my car. The first problems concerns me a lot. I have about 56,000 miles on my car and I know that a clutch replacement is about due. Anytime I am driving below 2000rpm, it feels that the car cuts out or lags at random times. When this happens, it feels about the same as when you set your car in cruise control and your car starts going down hill and then all of a sudden the cruise control decelartes in order to keep the set speed and then goes back on the gas again. Another example of how my problem feels is when your driving along and your car gets hit by a big gust of wind and the car slows down for a bit and then goes back to normal.

The second problem is when I make slow right hand turns it feels like something hits me under my seat but there is nothing on the floor behind me. Could this be a bad transmisson mount? Could this be related to the first problem?

The third problem is my Emergency brake light comes on when I get on the brakes. I checked the pads and I checked the brake fluid level. They don't appear to be bad. Any ideas?

 

[BooWFO]

the low rpm issues sounds more like detonation to me. Try a higher grade gas or gas from a different supplier. If possible pull a degree or 2 of timing.
the hit in the butt feeling. Check the control arms. Also while under there check the ds and make sure it's tight. Would also be a good time to look at the mounts, tranny, motor etc. Just might be time for a good old nuttin and bolting.
Brake light- been discussed many times, some with different sized tires on a abs car kick them, sometimes a TC car will throw it esp if you do a burnout with it on, then there is the pads, fluid, switch, etc. makes me glad I don't have abs or tc.

Hope some of it helps.