Ticking in the engine?

ATF is a good start for a ticking sound and all the advice given here is great.
Try checking your spark plug wires. I have found on several types of vehicles where spark plug wires are slightly cracked and will arc causing a ticking yet on higher RPM will not cause a miss.
Chances are you may have bumped the wires and caused this symptom while changing the oil etc. Hope this helps
 
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