Guys, I guess this has been asked a million times over the years, so apologies if someone shoots back with the required search result which I've yet to find.

So, when I first fire it up in the morning, it sometimes runs like a pig, pretty sure ignition related. Sometimes it will idle fine, but as soon as there is any load, it bogs down and, if I'm really lucky, starts to bunny hop down the road until the boost kicks in (not what you really want on a cold engine). The obvious answer I guess is coils, but it's not throwing any codes. I did have to replace one of the coils when I first put Gavin's tune on it, but it has been happy days since (that was probably a year ago). When that happened, it did throw a code and ran like a scooby.

I have replaced the spark plugs, which I think has improved things a bit, but still not perfect.

Thanks in advance for any pointers.