i noticed somethin similar with mine, it idled shitty and didn't run great but it was b/c i was runing regular gas in it instead of a higher octane gas that was suggested on the instructions of my autotech q-chip, gas gets expensive when ur outa a job for over a month so i hadda run with the cheap stuff. im back to using 94 octane now.
Well I would have to suggest checking your plugs and wires. I myself had the same issues, and I thought it was a fuel prob. But turned out to be bad wires and plugs. Hope all goes well and have a great Christmas.