I'm getting around 12" entering my blue vac amplifier on my 85 300TDT, only getting under 5" to my trans. When its cold the needle on my mityvac doesn't move when I increase throttle. Could a bad vac. amplifier be my problem? Has anyone heard of them going bad. I understand they are only on 85 and abouve model. Thanks
PS I'm getting a reading of 20" off of the main line.