check the vacuum with a guage at idle and see if it appears to be good or its erratic. Erratic means a leak or some such. Re-check all the vacuum lines.
Could be the throttle body stop screw needs to come up a little. If you adjust that you will also have to check the throttle posistion sensor to make sure the switch inside is closed to let the ECU know your at idle. Check all other electrical connections too as a big job like a BHG means you just about tear the motor down to parade rest.
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