After about an hour of driving in traffic, my car won’t go

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. Unfortunately, your concerns sound like they originate from an internal transmission concern. The flashing light indicates a recognized error with the electronic transmission systems. This does not sound easy to resolve without performing needed testing. A 1991 Toyota electronically controlled transmission is pretty primitive in nature as far as electronics go, but It is possible something that does not require a full tear down or replacement could be effective towards repair. You'll need the help of a shop near you. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.