89 jimmy with issue

89 4.3 tbi with 181k and the issue thats been happening is it started doing this about a week ago to me it runs fine till the engine gets warmed up then it wont idle without dieing out. it wont accelerate when u try give it gas it bogs down then backfires under the hood. the temp gauge goes up when this happens usually gets around 210-230 but i havent let get up past that. Any ideas of what would could be causing this.