[machone00]

Ok this has been happening for about the last 2 weeks I would start the car go out on the road accelerating to 55 mph at a constant rpm of 1500 it would studder ever 1-3 seconds and I can feel it jerk the car. When I go near 3000 rpms and up no power just blowing hot air. Thought it was time to change plugs so I got some pregaped autolight plugs from autozone. They were just slightly bigger gapped then my last plugs. Well I installed em last sunday took it for a drive road much smoother couldn't feel and jerking and had good power again. On thursday it started doing it again. Could it be a bad spark plug wire some can be taken off easier then others or could it be distributor or timing? I'm in tampa installing alarm systems for 4 more weeks then ill be going back home to panama city beach. I'm new at this just so you know. Fyi 2 months ago spark plug wire just fell off of cylinder #4 I believe nearest to passenger seat took me by surprise when I felt that

[Lind]

how many miles on the car/wires

if you have the extra money changing the wires wouldnt be a bad idea

sounds like a spark issue if it ran fine after putting new plugs, take a look at the ones you put in there and make sure you dont have excessive blow by (bad compression) in one cylinder

[machone00]

I bought the mustang back in january. It show 68xxx miles one the gauge I no for a fact it rolled over once but twice maybe. Ill go buy wires tomorrow and see if it changes. I was thinking bad compression to but how would I have to mess up putting new spark plugs in to cause it?

[Lind]

you said it ran fine after putting them in, so therefore it was creating good enough spark not to cause your issue, but if one wire is bad and not giving enough spark after a few weeks it will casue carbon build up and make the spark plug not/hardly fire, plus if your having a compression issue on that cylinder it doubles the problem lol

do a compression test on all cylinders and check your spark plugs/wires

replace if need be

[machone00]

Ok bummer. Bow I forgot tp mention the engine is stock only has a KandN filter on it. I believe I know what cylinder it is now when I took my last plugs out one was just early darker then the rest. Number 3 I believe. What's the price range on a compression test? I know it has to be done now but I don't like surprises and what should I go for wires?

[Lind]

you could do it yourself for the cost of the compression tester if you dont have one, if you want snap on i know they start at like 65 or something like that, as far as a shop doing it, id say probably $20 maybe lol not really sure, as far as wires go it all depends on how much you want to spend and what you use the car for, you could get by with autozone cheap bosch or ford racing, msd, accel, whatever

[machone00]

Ill get cheap wire for now due to after this month ill be getting my big paycheck and build a 351w after I get back home. Thanks for the help I'm thankful for it. If there is any other idea please inform me.

[machone00]

Awesome! I went to check plugs this morning and I found something I didn't see the day before. I'd post a picture but I'm on my black berry. I found a weird mark on the spark plug wire on number 4. Went to pepboys got cheap wires and made it back and felt that wire was more hotter then the rest. So I let the engine cool and changed them all and the one wire looked even worse then before. Cranked the car and took it for a spin. Ran much smoother than before! So pumped it was just a faulty wire xD. Thanks again