Engine Hesitates On Acceleration

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1990 Volkswagen Vanagon, 1990 Volkswagen Jetta, 1990 Volkswagen Golf, 1990 Volkswagen GTI, and 1990 Volkswagen Fox. However, it is still accessible from the selected car via links, so may be relevant.

Inspect intake air components for leaking hoses
Check injector spray pattern. Check for faulty injectors.
Check cold start valve for leaking (engine warm).
Check airflow sensor plate movement. Replace fuel distributor as necessary.
Check airflow sensor plate position. Adjust as necessary.
Check fuel system and control system pressure. Replace pressure regulator if necessary.
Test airflow sensor plate potentiometer. Adjust or replace as necessary.
Perform system electrical checks.
Check idle mixture CO adjustment. Adjust as necessary.