Question about 1999 Neon. Air is charged appropriately and running well. It seems that sometimes, with the air on, when shifting gears, (manual transmission) the engine will go up 500-800 rpm between shifts. Is there a reason for that? Is that normal with the small engines? Is there a sending unit somewhere that needs checking? I'm not sure if it does the same thing with the air off....it's swealtering down here and I haven't had it off. Thanks in advance for your input. As you can see, I'm not an expert mechanic.

2.0 DOHC
manual transmission