At times the car will idle like a champ at a steady 900 rpm and 1,000 - 1,100 with the a/c on. and then randomly the car will idle very low, around 200-300 rpm and want to die especially with the a/c off, and every now and then it will surge and them bam its perfect again. and also at times if im trying to hold a low speed in first gear the car wants to jump/ learch as if its starving for fuel and if i let it out of gear without giving the car gas the rpms will fall and the car will die instantly. iv changed IAC and IAT, and checked and triple checked for vac leaks.
motor is a b18c5 with full jun head package and more

 

Could a fuel filter and plugs be a good place to start? the plug wires are fresh.
Iv also been told that since i swaped manifolds that i could need a re tune because of the new amount of air flow but that dosent explain the sputtering and dying.

 

ANYONE?

 

I need sumthin.