idle is up and down

[GOT 2RBO]

my car was in the shop coz of crankwalk. the pistons was changed to arias 8.6:1 .030 overbore, rods are now eagle h beams, a different used crank shaft was re-surfaced and polished. while the car in the shop, a topspeed downpipe was installed eliminating the cat. now at idle the rpm goes up to about 1500rpm then drops to about 900rpm, then shoots up again and back down. sometimes it even shuts down when the rpm gets too low. my CEL is on ever since i got the car back 2 days ago. the problem goes away when the car is already hot. is it because of the oversized pistons or is it the the eliminated cat? i still have about 800 miles to go to complete the engine break-in.

sorry for the long post

 

[Spln_Hrd]

well i would check that cel, it could be on for a good reason.

i am doubting its the cat or the overbore, i have no cat. and i don't see how boring a motor would make it have spuratic idle

 

[Spln_Hrd]

you wouldn't happen to know fifty cent or ja rule would you?

*edit* you should get on your yahoo messenger i could help you more

 

[oldman]

Take it back to the shop and tell them to fix it.