Vehicle Shudder problems of the 2019 Ford Fusion

Prior to recall notice; on 12-20-19 husband noticed coolant l level down at approximately 7,000 miles. Went to local Ford dealer to purchase coolant. While there dealer asked several questions concerning specifics; like, is coolant leaking from your engine and is it visible on the ground; husband said no. Retuned home with coolant and filled the reservoir. January 18th, 2020, receive recall notice from Ford advising coolant may be intruding into the cylinders; advising to contact local dealer for service. January 21st, car into service to reprogram power train /cleared all codes. January 22st, 2020 took an 81 mile trip to lake and back; hours later checked the coolant and it was down again 5/8 's inch from max. January 23rd called the scheduled another appt for January 29th. January 29th 2020, mcspadden Ford had vehicle for 4. 5 hours to continue investigation into excessive coolant use. Upon pick up of vehicle, service manager advised they put car up on lift to look for leaks, negative. Hooked up computer and ran car for 20 minutes looking for anything unusual, no problems found. Remove valve covers, inspected block, pistons & cylinders. In process boke a spark plug that was replaced at no charge. Service manager advised they did not find anything to fix; we should just drive it like normal. Driving home at 1. 3 miles (4 min) car sputters. Another . 3 miles (1 min) car sputters, bucks, steering vibrates, car shakes. Another . 6 miles (1 min) , car sputters & bucks, steering vibrates, care shakes, rpm gauge bouncing, check engine lite comes on. Another . 5 miles (1 min) I pull off the highway into residential neighborhood and call mcspadden service who advise to immediately return the car to them if I am able. Car left again at the shop at 1-29-2020 5:45.