I have located a replacement engine for my 2003 2.4 Type-S (manual) from a 2007 2.4 exec (auto). The seller tells me that the engine is intact apart from the fact that 2 of the 4 coil packs are missing as he sold them to someone else. Just want to know if this is a big deal and if anybody had an idea of how much these will be to replace? Also would I be better to replace the other 2 coil packs while I'm at it? Also anything else that I should be checking / replacing while I am changing the engine? Thanks..