Hesitation, Poor Acceleration

Ensure clutch operates properly.
Ensure brakes do not drag.
Check fuel quality.
Check EGR system. See SYSTEM/COMP TESTS article.
Check spark plugs.
Check distributor.
Check engine compression.
Check throttle position sensor circuit. See CODE 41 in TESTS W/CODES article.
Check airflow meter circuit. See CODE 31 and CODE 32 in TESTS W/CODES article.
Water temperature sensor circuit. See CODE 22 in TESTS W/CODES article.
Check intake air temperature sensor circuit. See CODE 24 in TESTS W/CODES article.
Check main oxygen sensor circuit. See CODE 25 and CODE 26 in TESTS W/CODES article.
Check fuel pump and fuel pressure regulator. See SYSTEM/COMP TESTS article.
Check fuel lines for damage.
Check valve clearance and valve timing.
Check fuel injectors. See SYSTEM/COMP TESTS article.
Check cold start system. See SYSTEM/COMP TESTS article.
Check ECU. See SYSTEM/COMP TESTS article.