Could be wrong firing order too.If she was running OK before you did the work, my money's on the belt being off. There's a lot of alignment to maintain when installing a new belt - it's very common for something to be a bit off once you tension the belt and crank down the bolt. I've done 25-30 2.2L/2.5L belts over the years and still double-, triple-, and quadruple-check everything from the timing mark at zero (with #1 at TDC) to the intermediate shaft markings to the cam position.
I'm guessing the "honk-honk" you mentioned is a popping sound like she's just about to fire? This can be a telltale sign of a misaligned belt.