SR20det MAF problem

[mkslide]

i just put a Ka24 SOHC Mass air flow sensor in my SR20det redtop. The car does not idle very well. But i also have some kind of shipped/ROM ECU. There is a switch on the ecu. When i switched it the car idle was fine. And when i switched it back it was fine too. It is very random when the idle goes stupid. But when i drive the car it drives fine until i give it wide open throttle, then it seems to bog a litle. I had previously ran an actual REDTOP MAF and it ran just fine. But when i put this one on it started acting up. Could it be that the ecu can only read REDTOP MAF and not SOHCmaf or is it just a bad MAF ?
ALSO the car can drive fine and can rev as high as it wants it doesn't have that rev limit. Its just as soon as i start to spool the car seems to be holding back or in other words bog a little. Like you know the car wants to pull but something is holding it back.