Engine Misfire Cylinders 1 & 4

[DamageINC123]

Gentlemen,

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.

[Loren]

:welcome:

Your problem is only on two cylinders - so it is highly unlikely that it is a MAF prblem.

Look for cracked coil packs or poor connections on those two cylinder. Since you changed spark plugs recently then check the plugs for tightness and damage.

[DamageINC123]

Swapped coil packs 4 with 5 and misfire remains in cylinders 1 & 4. I drove all day yesterday without the issue unless I floored the car and ran past 6,000 on the tach. The car runs smooth as silk . I do not feel the misfire but will get the CEL.

[Loren]

Did you check the spark plugs?

[DamageINC123]

I did not replace them but I did make sure they were snugged. I guess I could replace them but that was just done 1,000 miles ago. I guess replacing them would be the only way to eliminate every possibility.