I have a '94 accord with a '95 Prelude vetch 2.2. The swap was done about 2 months ago and has run excellent untill recently. Now it idles somewhat rough, misses when accelerating and the engine light comes on as soon as it starts to warm up. I was told it sounded like an o2 sensor, so spent $220.00 and put one in. No change . Took it to the shop and had a diagnostics run, came back code #12, "egr system problem" was told to replace the egr valve, spent $270.00 and put it in. No change . I've got over $12000.00 into this car already, what do I try next?