I hate to be the bearer of bad news but it all has to come back off, if it is the timing belt the skipped a tooth. Get a timing gun and check the timing if the timing if off when you hold the revs steady that is your problem. adjusting the timing won't do anything that will just throw it out of whack more. The cam/ crank timing is off not the ignition timing so there is no quick fix.
Originally Posted by amb4081
What kind of a challenge does this present? Can I just adjust the ignition timing to compensate or do I have to pull everything back apart and reinstall the belt? Everything was lined up correctly before I put it back together. And the engine seems to be revving and operating the same way as before. Just sluggish. Can adjusting ignition timing fix this?