Hesitation/Poor Acceleration: Aerio

WARNING: This page is about a different car, the 2002 Suzuki XL-7, 2002 Suzuki Vitara, 2002 Suzuki Grand Vitara, 2002 Suzuki Esteem, and 2002 Suzuki Aerio. However, it is still accessible from the selected car via links, so may be relevant.

Faulty spark plugs. See IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article.
Faulty ignition coil. See IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article.
Faulty ECT sensor. See ECT sensor related DTCs in appropriate SELF DIAGNOSTICS article.
Faulty MAF sensor. See MAF sensor related DTCs in appropriate SELF DIAGNOSTICS article.
Faulty fuel injector(s). See B-1: FUEL INJECTOR CIRCUIT INSPECTION under CIRCUIT TESTS in BASIC DIAGNOSTIC PROCEDURES article.
Fuel pressure out of specification. See FUEL PRESSURE under FUEL SYSTEM in SYSTEM & COMPONENT TESTING article.
Faulty TP sensor. See TP sensor related DTCs in appropriate SELF DIAGNOSTICS article.
EGR system malfunction. See EGR valve related DTCs in appropriate SELF DIAGNOSTICS article.
Check for low engine compression. See MECHANICAL INSPECTION in BASIC DIAGNOSTIC PROCEDURES article.
Engine overheating. See engine overheating related DTCs in appropriate SELF DIAGNOSTICS article.
Check brake system for dragging brake. See appropriate DISC & DRUM article in BRAKES.
Check for slipping clutch. See appropriate FWD or RWD article in CLUTCHES.