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I am experience a surging between 1500 and 2500 rpms. It is worse going uphill, but does not do it above or below. It also does this in all gears. While parked the idling is good.

Here is what the Porsche mechanic said. He said the main line pressure for transmission fluid control loses pressure on and off which is a sign of a weak solenoid. He suggests to replace transmission ( I can't afford!) also, he says I can replace valve body or individual solenoids. Does this sound right?

1. He did a 89757 internal malfunction test with piwis tester - none registered.
2. fluid level - good.
3. tested MAF - good
4. tested for power and ground on TCM module - good
5. removed torque converter lock up wire and test drove- good
6. checked fuel pressure - good
7. no codes in vehicle
8. solenoid circuits are intact and complete
9. Tiptronic test - No codes

Diagnoses: He said the main line pressure was checked with a piwis tester and it it showed the main line for transmission fluid control loses pressure on and off which is a sign of a weak solenoid.

Is this possible, anyone experience this, and what is the cost of a repair?

I am a at loss. I need help!
 
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