Hard Shift from 1st to 2nd on auto tranny
Go to the autoparts store and get a can of MAF cleaner. I bet your MAF is dirty. When your MAF sensor gets dirty, it causes the transmission's line pressure to go through the roof and causes harsh shifts. This can lead to burnt clutches, so do this maintenance ASAP.
I'm willing to bet it's not a shift kit OR an aftermarket tune, but a simple dirty MAF sensor.
Have cleaned maf-sensor last weekend with non residual electrocleaner.
Big difference in shift quality !Also the car drives smoother in general,more responsive

Many Thanks!
We see this condition fairly often ourselves when cars come to us with intermittant symptoms and there is no apparent reason for the transmission to be acting up.
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