I've finally got my car back with a new used steering gearbox. I replaced the fuel filter but accidentally touched metal while changing the filter and blown my fuel pump relay. I replaced the relay (use) car started fine. Decided to replace the spark plugs and that’s when my hard starting problem occurred. I have new distributor cap, rotor, spark plug wires and spark plug within 5 months. What could be causing hard starting? Any help will be appreciated.

Thanks
R

1. Did you install non-resistor type spark plugs (recommended)?

2. Did you use a spark plug wire puller when removing spark plug wires?

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

Yes.