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I was able to test fuel pressure. I get a consistent 40 PSI even during the surging.
I also plugged in a spare TPS and moved it by hand and the engine responded to the movement and tried to rev.
After reading some other posts, I started to suspect the AFM. I disconnect it while the problem was happening and the engine seemed to rev cleaner but hit a soft limit at 2K.
A previous owner shorted the idle switch of the AFM so the fuel pump didn’t shut off for that test.
Any further ideas? Thanks for the help.
I also plugged in a spare TPS and moved it by hand and the engine responded to the movement and tried to rev.
After reading some other posts, I started to suspect the AFM. I disconnect it while the problem was happening and the engine seemed to rev cleaner but hit a soft limit at 2K.
A previous owner shorted the idle switch of the AFM so the fuel pump didn’t shut off for that test.
Any further ideas? Thanks for the help.