'93 Grand Prix LE, when I am coming down a grade or let off going up a steep climb there is a 'shudder' from the engine that shakes the car about a second after I release the gas pedal. Kind of like really abrupt engine braking. If it was right at the moment I lifted my foot I would understand it, but it has a lag. On level roads it does it, but after a much greater delay and not as severe. What is that all about?
TIA