I now have the following codes: P0234, P0303 and 304.

Car runs fine at idle but when you try to accelerate it misses. Once you get up to speed it's fine, but any attempt to speed up and it misses.

In the last year I've replaced the MAF, the vacuum hose from the radiator to the IAC. Read lots of posts about similar problems - replacing plugs, coils, and sundry other items. I need to fix this as inexpensively as possible as I've been unemployed for 4 months now.

Thanks.