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Boxster drivability issues

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97 boxster 5spd 127,xxxmiles. When i first got this car it had an issue where it has a dead spot in the rpm range when at wot. I replaced the maf sensor with an aftermarket one and it worked perfectly for 3 days with no bogging at all. Then wouldnt start. It would start if i unplugged the maf. Sent the maf back and got another aftermarket one. Same thing. Lasted 3 days then no start. Would start when outside temp was above 50 degrees or so but not if colder. Replaced the maf again. This time with a new bosch sensor. Now starts but has the mid rpm range bogging. Tried unhooking the battery to reset the ecu. Didnt seem to help. Do i need a porsche scanner to fix this problem? Does it need reset correctly or need a software update? Any ideas? Im an ase tech but dont normally work on porsche so im kinda lost on this one

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None of that is the issue. Basically if i put an aftermarket maf sensor on my car it runs perfect until i gets below 50 degrees then wont start. With a bosch sensor it starts up all the time but has a couple dead spots at wot. This problem is related to the maf for sure. I just cant figure out if i keep getting messed up sensors or there is a specific relearn procedure that i dont know about.

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Is it the MAF or a sensor that is sending a bad signal to the ECU?

Is there a relearn after battery disconnect? Yes...pretty long and complicated involving multiple runs at multiple throttle points and other variables. Until then the ECU uses some presets.

Are we sure that the Bosch MAF is the correct one for the model year you have? sometimes sold as B3130-70627? Same as the original "bad one"? Any sense that the ECU has ever been flashed?

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