[billyrb]

I just replaced the motor on a suburban I bought. When I bought it, the original motor was shot so I never got to hear it run. It idles and runs / drives, but there is a stumble both at idle and while accelerating. There is noticeable power loss, but it gets less noticeable when the rpm's get higher. Sometimes at idle you can barely tell, other times it's very noticeable. I checked the plugs and wires, and they are good. New distributor / cap / etc. I'm wondering if anyone has any suggestions?

On the passenger valve cover is a Purge Vac solenoid, and it has a line from the Charcoal Canister that connects to it, and a vac line from it to another solenoid back by the EFI electrical connector. But, there is a vac line on the side of that front-most Purge Vac solenoid that has no vac line connected to it.....anybody know what goes to this port?

Also, do the standard OBD-II scan tools pick up stumbles / misfires? Do they also provide real-time scans, or only pull codes from the PCM? I was thinking about taking it to the local AutoZone to borrow one of their scanners.....