Hey everyone, just a quick question. I am going to change my plugs and wires soon but I have some engine revving issue. From an idle, if I stop the pedal down and rev it up (in neutral) the engine stumbles until i gets up past 2000rpm or so then it spins up great after that. If I slowly push the pedal down and let the rpm's climb slowly then there is no hesitation. I'm pretty sure my car is running rich because I still cannot get it to go into closed loop. Frequency valve doesn't buzz. Only does this at low rpm while driving also, once I get above 2-2.5krpm the engine is smooth as can be. Thoughts?