After finally getting my engine in and started I've noticed a very low thumping sound that comes kind of randomly. I pretty sure it's a misfire but I was wondering what could cause it. Could the timing be off or maybe just a bad fuel filter? The engine also seems to almost die out sometimes. The RPMs drop and giving it a little gas seems to bring it back up to where it will hold for awhile.

 

mine did that for a while....my problem was a side seal on the front rotor....it actually unstuck itself after a few weeks....find a place and do a compression test and post the numbers

 

it could be the tps that is causing the odd ideling but i agree with 1point3 get a comp test done. i had mine done cause i have the same thing as you do but i dont remember my #s. i replaced my fuel pump (which everyone should do often)) and replaced my spark plugs but no change