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Replaced Catalytic Converter and Fuel Economy Dropped
I went to a transmission shop because my Jimmy was having trouble accelerating on an incline. Also, my coworkers commented on a rattle coming from the Jimmy. After a drive, the transmission tech said the transmission was fine, but the poor acceleration and rattle indicated the catalytic converter. An exhaust shop replaced the catalytic converter with a "universal" model. The acceleration problem and rattle are gone, but I'm losing about 70 miles per 3/4 tank. Any suggestions before I go back to the exhaust shop? Would an OEM part (if I can find one) be better?