2.5L ('98-'01) 99 2.5 Lima MAP Sensor location???

[Leigh]

Many videos of the MAP Sensor "sitting" right on top of the intake manifold, in plain sight on the 2.3L, but on my 2.5L Lima I'm baffled!
Searched over and under the manifold with a bright flashlight, and a mirror an, dummy me, I can't seem find it!---Need some Help please.
Leigh

 

[Blmpkn]

Map like.. manifold absolute pressure? Should have a MAF

 

[Leigh]

I'm having to "tease" the throttle a little at a time to get up to speed, without bogging down. Happens in all gears/ speeds.

Replaced Fuel pump & Filter, have 65 PSI at the rail.
Treated with multiple injector cleaners
Replaced MAF Sensor, TPS, IAC Valve, EGR Valve, PCV Valve. & intake Air filter.
No vacuum leaks as per Smoke test.
No further Codes,
I'm at my wit's end with this engine.

 

[Leigh]

Took it for a road test with an OB2, and it hesitated as always but this time also revved up on it's own with throttle backed off. It's done that before and then stopped doing it but this time I got a P0500 VSS Circuit Malfunction. Since the rev-up is intermittent, no way of knowing whether it's a faulty VSS, or the Code if the code is generated due to something else causing the rev-up, and I'm fed up with throwing parts at it to no avail!!!

Got another of many previous P1506 IAC overspeed error code's but I've tried 3 different IAC Valves, and yet the same Code keep's coming.

Maybe it's time to junk this piece of crap, and seek an older model with a good old, reliable carburetor

 

[scotts90ranger]

The VSS is tied to the IAC so it is likely an issue with the VSS, there's several posts over the years of erratic idle from that.

There has to be something going on, what does the airflow show at idle? The grams per second should be similar to the displacement from what I hear. Also dumb question, are all 8 spark plug wires going to the right place? You can mix up 1 and 4 or 2 and 3 on the coil packs but not between those pairs. Other question is if the cam sensor is lined up correctly?