PFR6B is the common replacement plug and using PFR7B is of no issue at all and something we have done on may cars for the past 20yrs or so...........
std boost gapping of around 0.7 / 0.75mm works fine and if more heavily modded we reduce to 0.65mm
if the plugs were new and undamaged / gapped correctly then highly unlikely this is any issue
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