2003 Buick Lesabre High gear chugs under load

2003 BUICK LESABRE
110,000 MILES • V8 • FWD • AUTOMATIC
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My Lesabre started to chug in high gear under load.Replaced tps to no avail. Changed spark plugs also. This all sometime after had trany re-built. This happens going up hill or speeding up in high gear,before it goes into passing gear.
Jun 14, 2010 at 9:04 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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