1989 Ford Bronco II Malfunction - Fuel System

Question: My son purchased a 1989 Bronco II with 2.9 v6 and it ran fine for about three months than started having trouble with loss of power. Runs alright around town but can hardly get it up to 60 mph out of town. The rpm's go up when given gas but the speed does not. Have taken it to two mechanics and they have installed a new O2 sensor, map sensor, fuel regulator, checked compression and exhaust system and fuel pressure. Installed new spark plugs and the is firing ok and getting fuel. Acts like transmission is slipping but its not. Got any suggestions?

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Technican: Hi; Might want to make sure the transfer case is not half way engaged. If four wheel drive make sure that the linkage is properly adjusted. .

Owner: I forgot to mention that I have unhooked the airconditioner clutch because when it kicked on the idle would go way down to the point of almost dying also when driven for a distance it would die at stops. If the airconditioner relay has a short in it would it cause it to run as I first indicated?

Technican: Hi; The answer to your question would be no.A bad air control valve would cause the engine not to idle up when the ac is on. Thanks.

Owner: Les, How do I determine if the transfer case is half engaged?

Technican: Hi; Try moving the shifter to 4 wheel high and then low and then neutral. Then put it back in 2 wheel drive. While going down the road if it starts sounding like is slipping put small amount of pressure on the shifter to see if this helps it. Thanks.

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