Shouldn't have made any difference. Check that there is enough fluid in the transmission. Check it idling in park.
Engine idling in park
The same on a car equipped with manual transmission. On an automatic equipped car it will use less idling.
Idling in neutral.
Trans fluid is always checked with car level and idling while warmed up.
take it to a mechanic for a diagnostic DO NOT CUT ANYTHING try changing the oc sensors that worked for me
Transmission mounts are bad
Well, a transmission itself does not idle...the engine does. A vacuum leak in the engine will cause faster idling or slower idling depending on where the leak is. Newer transmissions do not use vacuum at all for their operation. Older vehicles used vacuum to help with the shifting of gears-automatic transmissions.
Sounds like you need a ring job, white/grey smoke from the exhaust usually means oil is burning in your engine. Your engine may need a tune up or a compression check, bring it in to your mechanic.
The engine should be hot and idling in park.
Leave idling, on level ground, at running temp