idles and revs in park, stumbles while in gear

[davidchecker]

Thanks for having me in the group, naturally I'm here because of a problem - 2003 S40 idles and revs in park normally, stumbles while in gear, seems to play nice as long as I don't press on the accelerator while in gear) Think it's to do with the fuel system or maybe it's in Limp Home Mode, but I'm far from experienced at this.

Had EVAP codes, replaced the booster solenoid, boost sensor, and all the vacuum lines around and attached to the fuel pressure regulator, replaced the air filter. Codes cleared, "check engine" light went away (hurray!). Don't get codes (from my Android app reader), have a mild gas seepage that will need attention, but it idles like a top. Bought from a mechanic about a month ago, he put in a new fuel pump.
Disconnected the battery, touched the leads for a few minutes. That's about it.

Seems like Limp Home Mode, but no reason I can think of.

Later: Thinking Throttle body or position sensor, perhaps both. Live data on OBD shows rpms and throttle position not running in parallel all the time.