i have a 90 honda accord ex that had the timing belt break and bent four valves. i had the head redone and new valves installed. when i reassembled, i couldnt get the timing marks to line up right, but the car ran fine. the only problem was that tons of heat came out of the heater vents and the engine felt VERY hot, but the temp gauge read fine. figuring that i was one tooth off on the timing belt, i took the engine apart and moved the belt one tooth on the camshaft sprocket. when i put it together and went to check the timing, everything lined up perfectly. assuming i had fixed the problem, i take the car out around the block and there isnt any heat coming from the vents, and when i checked, the engine felt like it was running at a much more reasonable temp. the only problem is i have NO low end power and it seems to get worse the more i drive. i get almost no response until i hit about 2000 rpms. when i punch it or go to take off from the line it just hesistates, then slowly moves until i hit about 2000, then it respondes normally. i also changed the spark plugs when i took the engine apart and moved it one tooth.

My questions are:
1)why do i have no low end power.
2)are the spark plugs bad
3)was i better off with the timing belt one tooth off where the engine seemed to function normally
4)if so, why all the extra heat coming from the vents and the engine
5)since thermostats are determined by the valve temp, and i had the valve job done, do i need to install a new thermostat to correlate with the new valve temp (ther mechanic who did the valve job said that the valves would be set to the hot side)