Try having the wheels and tires rebalanced at a tire shop. The driveshaft may also be out of balance. Consider having the U-joints inspected and replaced if necessary. SN-95 Mustangs aren't six-figure-priced, premium luxury sedans, so there's always the chance that an individual car is going to have some strange quirk not found in other cars. Also, try another dealership or get other opinions from various automotive shops other than a Ford dealer.
A BuckerI have a 118,000-mile '86 Mustang GT with a five-speed. The car tends to buck when I slow down in hot weather. This is usually only in First and Second gears. I've rebuilt the engine, cleaned the fuel-injection system twice, replaced the clutch, and had the transmission overhauled. I didn't do the work because of the bucking problem, but because I felt it needed to be done. Do you have any suggestions on what could be causing this?Chris JacheManchester, NH
This one is also tough to discern without being in the car. Though it's usually a problem under load rather than during deceleration, I wonder if it's ignition related. The thick-film ignition (TFI) modules in EEC-IV-equipped 5.0s have been known to become defective after a while.
The TFI module is about the size of a credit card and attaches to the side of the distributor on '86-'95 5.0s. The EEC harness plugs in to it and electronically connects the distributor to the car. Replacing the module is a start. You can also take the car to a local shop or dealer and have the EEC processor checked to see if there are any trouble codes.
There's an informative Web site I recently discovered that might be helpful to you, as well as anyone else interested in Fox and SN-95 Mustang EFI systems: www.fordfuelinjection.com.