Hi everyone,
Got an interesting issue with my '55 GT (DE engine)
When coming off the throttle (engine braking) and occasionally when applying the throttle afterwards the car jerks/bounces two or three times. I can 'cancel' the bouncing by disengaging the clutch. Looking at the tachometer I can see the revs drop (when letting off the throttle, as it should) before stopping for half a second, then dropping a few hundred again, then stopping, then dropping. Instead of a smooth engine brake, its a bouncy ride down the tach
Acceleration is fine. No issues climbing the revs, no issues idling. MAF was cleaned then replaced for a new one (thought I didn't clean it right) and the throttle has been cleaned and then replaced for a much lower-mileage used one (thought I'd buggered the original one when cleaning the valve)
The jerking is most obvious in gears 1-2 and lessens the closer to 6th I get, when I can't feel it at all. Temperature doesn't affect it - happens from when I start the car cold in the morning to when I arrive at work 20 miles later after some city and motorway driving
After some research I believe it could be either the engine or transmission mounts. Do the symptoms sound similar to anyone on here with more experience of the car and its drivetrain?
Brief history; owned the car for a year, been through two full services (all fluids changed - engine, clutch, brake and transmission) and one minor service (engine) over the 15k miles I've done with it
Only mods are a pop charger, plenum spacer and Whiteline diff inserts (not the full replacement bushes). The issue has appeared over the last 3-4 months (mods were installed shortly after I bought the car 12 months ago)
Any advise or theories are appreciated. Not completely enjoying the car at the moment as I do a lot of town driving and I'm bouncing all over the place whenever I take my foot off or on to the 'go' pedal. The slip road onto the motorway is still good fun though!