newbie needs help

hi, ive just got myself a 96 n reg audi coupe 2.6e v6. ive replaiced both headgaskets, plugs, iol, oil filter. and also 3 lifters cause it was tapping from the passenger side head. the problem is the tapping, it comes and goes and its quite loud. it put people off when they come to view it. i changed some lifters cause they were corroded and it stopped tapping. but now it comes and goes. has anyone got any advice please.
 
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