Did you check fuel pressure after replacing the pump ?
If the regulator fails, it would either not maintain normal pressure, or leak fuel into the vac hose.
If the mass airflow meter fails, it won't run and the check engine light would be on.
Have you watched the O2 sensor and engine temp sensor on a scanner to see what they are reading ?
SOURCE: My 1995 Plymouth Voyager loses power, surges and backfires.
My first instinct tells me timing chain or belt, but it could be a vacuum line loose, cracked or disconnected. Using a stethoscope, or a length of gasline hose held to your ear, and with the engine running, listen for a hissing sound. Be sure and wiggle all the hoses you can. You might make one hiss. If you don't find anything, get a timing light, and check your timing marks. They should stay in basically one spot. If it's jumping around a lot, you need a new timing chain or belt. Good luck.
SOURCE: 1990 plymouth acclaim is burning gas like it was
Change the mass air flow meter firstly if they are faulty then you will use excessive fuel.
SOURCE: It's a 92 Plymouth laser 1.8 none turbo, wont
Hello! system dropped our chat... probe onto the Gray/White and - probe on the Gray/black...Meter set to read 5 volts...start engine...Meter must read less than 1 volt (.85)...Slowly increase throttle...Meter must read 4 volts at full throttle...Voltage must increase smoothly...If it jumps, jerks or acts erratic the TPS is defective....saailer
I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867
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