You mean to say you never exceeded 2500-3000 RPM while climbing the hill. Was that feathering the gas pedal or shoving it to the floor?

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If you had the gas pedal depressed fully depressed (WOT) you were in open loop. The PCM depends upon input from several key sensors while accelerating, aka, WOT, for timing, fuel sync/injector band width (air-fuel mixture). The Cam Sensor, CPS, MAP sensor and the TPS are key players. I suggest you do some testing of these sensors to see if they are functioning within spec. There's TPS and CPS testing procedures on this forum but I don't think MAP sensor testing is addressed.

Map sensor testing is simple. See pics.

You'll need a digital Voltmeter.

Operate the engine until it comes up to operating temp.

Back probe the MAP connector like in the pic. Probe between pins 1 and 2. Pin 1 is the Brown/Yellow tracer wire, pin 2 is the Dark Green/Red tracer wire. You're checking the MAP output voltage.

With the key to RUN, engine off, you should see 4 to 5 volts. Start the engine and let it idle, voltage should drop to 1.5 to 2.1 volts.



Normal vacuum at idle is around 17 to 18 in. hg. (min. 13 in. hg.) While the engine is under heavy load the vacuum may drop to near zero.