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Engine Misfire Cylinders 1 & 4

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I had posted a something earlier this week but did not have the specifics. Below is a little more detail with issue.

Now that I have the exact codes I need some help. I have 97 with 30,000 miles. All services including 30,000 mile tune up have been done by the dealer. The car runs like a champ!! Although I keep getting the CEL when I drive aggressive (tach around 6.5). The codes are p300, p301, p304. Pending codes 1313, 1319, 1316. All point to misfire and emmisions related to cylinders 1 & 4. I put in a new MAS but that did not correct the issue. I was thinking an air leak but I am not getting the symptons (IE wondering tach on idle). I put some techron fuel injector cleaner in last night. I am hoping that its a clog fuel injector with low miles i have. Since I am getting the same 2 cylinders every time I check the codes and reset, could it be bad coil or plug on cylinder 1 & 4? We just put new plugs in not long ago. Any suggestion would help.

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