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Hey guys, great site!!

1.6L, DOHC, auto, 100,000 miles
On occasion (up to 20%) from a stop there would be minimum acceleration from 0 to 25mph (seems like letting go of the brakes going downhill). At about 25mph it starts to accelerate normally. I have replaced: spark plugs, spark plug wires, fuel filter, air filter, dist cap and rotor and 02 sensor. The only replacement which did made a difference was the 02 sensor which made the engine more aggressive in gear changes (imo). I also have noticed the upshift from 1st to 2nd is noticeably more jerky. During the slow acceleration the engine is not revving any higher (and it is in 1st gear because I can manually downshift to 1st). I have tried starting off in 1st gear a few times and it is fine.
The acceleration issue "may" have started when we replaced the tube between the exhaust manifold and cat converter. The distributor is leaking oil (not sure if that is the issue). Tranny fluid looks clean and at proper level.
Could it be the transmission? Cat converter? Fuel pump? (I can hear the pump working before I crank the engine)
I have just cleaned the MAF sensor but some issue.

Any help would be greatly appreciated!
 

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Maybe it is a solenoid that control the first en second gear change. Cause if it goes well when you downshift manually, it may be a solenoid.
 
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