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2500rpm limit is maf
If it sometimes does and sometimes does not
its ECU/Wiring most likely
simply replace the wiring and or computer.
Wiring is 3 wires for stock maf sensor.
There is a fourth "wire" called shielding which grounds at the computer,
because this wire is a ground and because it cover the signal wire "like a sheath"
It is very common for the wire to become cut and the ground to touch the signal intermittently
My approach for most cars would be:
1. goto junkyard and pull some shielded wire out of a common foreign cars like Toyota etc... (I keep a bag of them handy nowadays) inspect them thoroughly
2. install new shielded wiring for maf (or other sensors)
3. change plug for sensor or verify the plug is good somehow
Only thing left after that is computer
finally CAS control timing and needs to be set with a timing light
you cant just stick it back in and hope its close
even just 3 or 4 degrees off can be disaster, will run awful or knock or both
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