ok here's the deal. i have a 91 crx dx, with a d16z6. i'm using a 89 si ecu and a si distributor. when i accelerate it kinda feels like it hesitates, but at wot it is just fine. and sometimes from an idle when i give it gas, it sputters a little. my timing is right on. new plugs and wires. new ignition module. any clues as to what this could be?

any help would be great.