85 monte 4.3 erratic idle

[sinful85]

so I swapped my old 4.3 for one out of a 86 chevy blazer. the motor ran great in the blazer but after getting everything hooked up I get erratic idling and poor response from the car. throttle body is new as well any ideas where to start?

[maxwedge]

Look for vacuum leaks and an egr valve not seating closed.

[sinful85]

Thank bud I'll give that a try I noticed the sensor for the egr broke any clue where I can get a new sensor

[maxwedge]

Try napa or a dealer.