Surge at idle
 

I have a 1994 B3000 that surges at idle. Just got the fuel injectors rebuilt, plugs are OK. Pulled the engine and tranny (standard) last year to do some work on both, surging was there before. No error codes at this time. Also thethrottle seems to stick when driving until I push in the clutch, then it revs up a bit and settles down to normal. Any suggestions?