2004 Baja

I have recently purchased a 2004 non turbo Baja. 170,000k miles. Smelled of gas at start up and coded an O2 sensor and replaced both O2 sensors. The vehicle has a small tick in the engine for about 5 minutes and quiets down after warming. Did a oil change after adding Seafoam to crankcase after driving for about 5 minutes. Added 1Qt Lucas oil and 3 Qt 5 30 oil change and Also added seafoam to air intake. Still has the start up tick. Any ideas or suggestions on how to proceed from here? Thanks, Randy
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