i have a 1990 150 with 360,auto,4x4.when i first start it,it idles rough,like a dead miss.as it warms up u hold the throttle in 1 spot and it surges.could this b a bad throttle body?also when shut down it looks like it has a small drip from injecters.could this be flooding it overnite .any help would b appreciated

Throttle body may just need cleaned. Surging could be bad spot in TPS. I would clean throttle throat first and see how it runs.