I have recently become the proud(?) owner of a 1994 Eldorado. Finding out the Northstar engines have major problems with oil leakage, but my concern at this point is the transmission problem I have. At roughly 45 mph or so under light to moderate acceleration I get a severe shudder. This lasts up to about 50 mph. Anything below that is fine, anything above is fine. Rapid acceleration is fine as well. It seems to only be under light to moderate that I get it. A few of us think it is probably in the torque converter. Are we on the right track or is there a switch or relay that could cause this situation as well?