drew125

My car is very drivable, but when ever i am in overdrive cruising it has a occasional hiccup. I had my fuel filter changed, that made it a whole lot better. The hiccup is still there, its worse when i am trying to climb a hill with low rpms in overdrive, If i am in 1st-3rd gear it wont do it at all . Any ideas on this?

I have a 99 ford mustang, 3.8L 6 cly. automatic

jwog666

sounds like an ignition missfire, sometimes old plugs, wires and /or a faulty coil pack can cause a miss if engine load is high and you are in a high gear.

drew125

To add more to this, this morning i started my car from a cold start. It was jerking and skipping bad. When the engine heated up it stopped. I still felt it doing it occasionaly, but way better than when i first started it. And i have had to replace the coil pack 3 times in the last 5 months. The factory one failed, bought another one that one failed replaced it , then the replacement failed within 2 weeks, now i am on the third one its a duralast. I have had it for about 2 months.

drew125

Can the car be burning coil packs?

jwog666

i would try an OE coil, there may be some reliability issues with the duralast

drew125

Would coil cause this issue? when its cold show out. When its heats up act normal.

drew125

i just changed the coil and it still has the skip. It is less than before but still there.

drew125

Could this be the egr valve? I have a p0455 code but no egr code.

Z28KLR

Have you checked/replaced the spark plugs yet? Always start with the simplest and least expensive things...

drew125

There only 1-2 years old. Duralast wires and bosh plugs,