My '98 Lumina exhibits what almost feels like a slight mis-fire at speed, when travelling along say at 50 mph at a steady rate and when I reach a slight grade. If I acclerate up the grade very gently it feels like a slight mis-fire; if I accelerate hard (and it downshifts) there is no missing.
An engine specialist checked it out and reported it wasn't an engine or electrical problem (no codes etc). He suspects it might be transmission/torque converter related.
A transmission specialist says he's not positive it is a transmission problem and would hate to charge me 10 hours labour (plus parts) to find out it wasn't the tranny!
Is anyone aware of similar problems with Lumina tranny's? Thanks.
PJ