Idle instability and random misfires
Intermittent misfire and rough idle behavior traced through data and verification steps.
Performance Diagnostics
Find the real problem before money is spent in the wrong place.
Foulks Performance handles diagnostics with a performance mindset. The goal is clear root-cause answers for fueling, ignition, boost, and electrical behavior so the repair plan actually solves the issue.
Common Issues
Symptoms that need diagnostics, not parts-cannon guessing.
Fueling and drivability issues
Hesitation, surge, bog, and unexpected AFR behavior after modifications or tune changes.
Boost, sensor, or electrical faults
Performance drop-off tied to boost leaks, sensor reporting errors, or harness and grounding problems.
Related Services
Diagnose first, then tune or repair with confidence.
01
Dyno tuning
Use stable diagnostics as the baseline before calibration changes are finalized.
Open service 02EFI tuning
Map refinement and drivability work after underlying faults are verified and corrected.
Open service 03Wiring and electrical service
Harness, sensor, and integration repairs for swap projects and difficult electrical problems.
Open service