weird noise?

[chengsta]

Lately when I start the car after it has been sitting for awhile I hear a *knock* *knock* noise coming from lower part of the engine on the timing belt side. It'll do it every so often at idle but once I drive the car for a bit and let it sit again then the noise is no more. I hate to think its crankwalk but just want some input if anyone would have any ideas. Thanks.

Mods: '99 eclipse spyder gs-t
-upper & lower intercooler piping w/ SSQV
-evo3 big16 turbo
-n1 3in turbo back exhaust
-SAFC(settings still all at "0")
-NGK plugs and wires
-valve cover breather
-boost & a/f gauge

If it turns out to be crankwalk it looks like I'll most likely be doing stroker kit or should I just go do a 6bolt swap (2g pistons and 1g rods)?. Any stroker kit out there you would recommend over the other?