I Have A 1988 Non-turbo Rx-7 When I Start It In The Am. I Have To Let It Warm Up For About 10-15 Min. During This Time It Is Pulsating For About 5 Mins If I Don't Let It Warm Up It Will Drive But In About 45min It Will Start The Pulsaing And Will Not Drive, When I Push On The Gas The Pulsasing Gets Louder I Have To Turn The Car Off And Let It Set For 10-30 Min What Is Going On With This Can Someone Help.

 

Try a tune up and a TPS adjustment.