I have went through all of my vacuum hoses and two were off, some were brittle and I changed them out. But I still have the surging problem. I cleared out the code on 8 and 14. After letting the car sit in idle it will surge between 500 and 1200 rpm. I then checked the codes again and am getting a code 5 off of pin 8. Does anybody know were the CTP is and how to check it??

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Gary

E320 1994
ML320 1998