1994 Cadillac Fleetwood Q&A

1994 Cadillac Fleetwood Question: What causes shudder at torque converter lockup

about 45 to 50 miles per hour -
Answer 1
Torque converter itself or engine misfire(s) that's more pronounced with converter locked. Light on? -
Comment 1
No CEL after fully warm 30 min any heavy gas pedal and its there add on occasional not -
Comment 2
GOOD tune up should do the trick! -
Comment 3
New plugs & wires. it has slight hickup idling in gear at stop light and car tries to move with miss at times but goes smooth when put in neutral -
Comment 4
When the car gets into the highest gear (converter locked) ANY engine misfire is amplfied and just might feel like a shudder. Probably not felt in any lower gear. Scanner needed!! -
Answer 2
If it's only when 'lock-up' occurs , try doing a trans fluid chang, using factory fluid. (NOT a flush) see if that helps the symptom. -