If you are idling in gear at less than 600 rpm..the cam must be mild or you are pig rich compensating for a diluted intake charge with a larger cam.
It's a fairly mild cam,,, it's this one:
COMP Cams 12-564-4
COMP Cams Nitrous HP Camshafts
Hydraulic flat tappet
Intake Duration at 050 inch Lift 230
Exhaust Duration at 050 inch Lift 244
Duration at 050 inch Lift 230 int./244 exh.
Advertised Intake Duration 274
Advertised Exhaust Duration 292
Advertised Duration 274 int./292 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.487 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.501 in.
Valve Lift with Factory Rocker Arm Ratio 0.487 int./0.501 exh. lift
Lobe Separation (degrees) 113
You have a 400 rpm drop going from park to drive?What convertor are you running?
it's the B&M Holeshot 2400
I tend to play around with things and have them off and on throughout the season. I'm guessing I have a slight vacuum leak somewhere right now. I'll be spraying it down this weekend to try to find it.
On a side note, I'm fairly sure I got some bad gas in the car just the other day also. Once I drained the cell and lines, and put in new stuff, it began to clear up some.
Depending on the mood of the week, and the mood of the car, the idle gets tweaked a few times a year. On average, I'd say I usually idle around 800-900 in park and 600 or so in gear. I'll get it back there sooner or later. I think I've just became hyper sensitive to every little change,,, maybe it's not that big of deal right now.
At one time I used to have quite a bit of "blower surge", up and down 800-1200. It sounded kinda neat, but got to be irritating. That's when I ended up getting it to idle smooth, and also ended up with a "in gear" idle down around 450-500. It seemed awful low, but it really was running good and I left it. I switch back and forth on my favorite sound though, I'll tweak it for a smooth idle for a while, then I'll go back to the intentional surge. I guess what I'm saying is I can't leave anything alone, and end up causing myself grief from time to time.
Did the cam specs and convertor choice stand out and scream any problems to you?
thanks much for all your insight.