Engine runs rough, misfires, lacks power
Symptoms
Uneven idle, hesitation under acceleration, flat spots, check engine light (if fitted).
Cause
Ignition system faults are common. The Bosch EZ-series electronic ignition uses a distributor with a Hall effect sensor, ignition coil, and power stage module. The power stage (mounted on the inner wing) can fail. Spark plug leads perish. The distributor cap and rotor wear. The MAF sensor (on later fuel-injected models) can fail or get contaminated.
Fix
Start with the basics, new spark plugs (use OEM spec), leads, cap, and rotor.
Check the power stage with a multimeter (there are test procedures in the workshop manual).
Inspect the distributor for wear or cracks.
If fitted with an MAF sensor, clean it or replace if faulty.
Check fuel pressure and injector spray pattern.
Compression test to rule out mechanical issues.
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