I have a 1991 mustang with a 347 and the hp efi system, and I am having terrible vibrations. The engine seemed to have lost power on the highway yesterday, I tried to floor it and it felt like I was at 1/3 throttle. At idle and under load during low rpm, there is terrible vibrations. The cl comp seems to be okay, although on my morning commute I would see it around zero % at cruising, but sometimes it would go to -25+% while under the same condition. If anyone has anyone ideas, or anything to check, please let me know, I checked the transmission fluid and did a visual check this morning but nothing was out of the ordinary. I feel like the motor mounts may be to blame, but I am unsure what would cause them to ‘fail’ so suddenly. Thanks