1989 Omni engine not reving out

[lakotie]

i bought my Omni a few months ago and i have been in the process of getting it on the road, after new brake lines and parts, fuel lines, filter, oilchanges and so on, i took it for a test drive, and when it warms up, the car will not rev BELOW 1500 and when im on the gas, it will not rev over 4000, it doesn't matter if i am hard on the gas or not...it is a 1989 Omni, 5 speed. 2.2L motor. i read something about maybe being the MAP sensor..i need to get this car on the road soon! thanks your help
pls email me @ [email protected]