Joseph Emerson wrote: 91 Pontiac Grand Am 2.5L TBI.
Acceleration tends to warble (doesn't hold steady), especially on hills.
Replaced fuel filter. Replaced spark plugs.
Replaced cracked ignition module.
Replaced coil packs (one was bad).
Problem still exists. Anything I may have overlooked?
Please provide a little more info; POSSIBLE ADDITIONAL INFO:
Actual throttle pressure (light,cruise, full), vehicle speed, period
or frequency of warble, description of warble (sound and feeling),
any action that makes warble better or worse, difference in
warble on steep/mild hills, downhill, level pavement, etc.
Good Luck. Wendy & John.
Last incident, going uphill steady on the gas pedal about 25-30 mph.
Usually warbles going uphill in second gear before the AT shifts into 3rd.
Sounds like a momentary dip in RPMs, as if I let up on the pedal.
Disconnected the TCC (sticks and causes car to stall at a full stop.)
Doesn't warble downhill or on level pavement.
Anything else you might need? Joseph Emerson
No, thank you. I don't need anything else.
The symptoms described may simply indicate AT shift point hunting.
A newsgroup reader with more experience than mine may recognize
another problem and suggest a solution. Posters here gladly provide
helpful suggestions for appreciative car owners.
Wendy & John.