Thanks for the comment there Mike, and so yeah, not wanting to leave this unresolved, I thought for the longest time that the MS2 unit was faulty. I fixed all sorts of minor issues that could have caused bad running, timing, plugs, checked wiring etc. Still acceleration enrichment wouldn't kick in, it would work once then not again for several seconds. I reduced the sensitivity (lag factor) which didnt work, tried different cables still no joy. In the end I took the TPS off wired it with a short cable right next to the MS2, turning the pot at exactly the same time as I bilpped the throttle, and to my surprise AE worked every time. I read somewhere that someone had used an XLR cable for the TPS with great results, I tried that and happily it worked well. Unfortunately just as I have been tuning it, the coil pack started failing, oddly the coil that does 1 and 6 only fires on 6 which would explain why doing the timing was a bit intermittent. Seen a new Lucas one (ERR6269) on fleebay for 47 pounds... Sounds too cheap.