car dosint like to rev past 4500

I'm sorry man but can you explain your problems in greater detail? I kinda don't understand what you are asking. Switching mafs on any car is a no no. If you have a dohc ka24 make sure you maf is for a dohc ka24 or ka24de.

the kid that had the car B4 me ka T the 240 and i guess his turning was swaping the maf. Curintly i changed the MAF and am running the DOHC maf. but he same problem still occuras. but to explane my problem better. say you have a normal bridg. one that inclines up and declins down. After berring the load of going up hill and wanting to cost once reeching that top is the best way to explane the proble. I go up the Hill berring load on the motor say 4 gear 3000rpm. then droping it into nutral once i reech the crest of the hill. the car tends to low iddle or even bod down till it shuts off on the down hill part. But the same problem occurs on a st8 away with a red light say 500 feet away. 1 -4 gear not reeching past 3000 rpm each gear. then putting it into nutral and then normaly breaking to stop for the light. The car bogs down to a 500 rpm rev on ocation will being on the break it will bog till its shuts off. when i am at 500 rpm it dosint run rought. it just runs iddles at 500 rpm. no engin rock or sputtering nuthing. its like it dosint bothere the motor. but that i have no emmisions on the car i know that the iddle cand drop lower then 650 max but should stay at 7- 750 rpm. Hope i explaned it enought but thats the best i can honistly explane when it happnes and when leads to it happining. So if you could get back at me with an andswer.