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**cowmilker08** · 06-08-2010

My fiance's car stumples when you give it some throttle after its been running for awhile. If I start it up and snap it to 3k rpm it preforms just fine, but then if I let it sit there for a few minutes and then try to snap it to 3k rpm, it'll stumple a little bit and then go to 3k rpm.
Also when driving in any gear if you give it enough throttle it stumple a little bit the recover just to stumble some more.
I don't know a whole lot about gasoline engines, diesels are my thing, so I don't really know where to start.
My father-in-law-to-be says it sounds like its loading up. He said I should start by running a bottle of injector clean through a tank of fuel.

**SlowNA06** · 06-08-2010

When was the last time you replaced the fuel filter?
Spark plugs, wires, MAF, intake filter, weak fuel pump(?) may all be culprits. Maybe a clogged cat (doubtful?)? 118,000 isn't bad if it's been maintained. I'd start at cheap/easy and work my way down the list.

**cowmilker08** · 06-09-2010

It the PO did an awesome job maintaining it. I don't know whether or not any of those things were ever replaced. I know that an O2 was replaced sometime after her parents bought the car for her. (But don't these have two?

)
Can you post video on this forum?
If so, I will.
What would you start with then?

**mikedinthecity** · 06-12-2010

is there an engine light on, or any codes in the computer? this usually will tell if it is a sensor....usually.

**cowmilker08** · 06-15-2010

Well, finally a CEL was set.
Code reader said cylinder 1 misfire.
I changed the plug, the ceramic part looked cracked.
It ran fine for a little while, but started stumbling again. Not as bad as b4 though.
Also it seems interesting that that wire is the only one thats not a factory wire.?
Next step is to replace that.

**nascartech** · 06-15-2010

do plugs wires and fuel filter

**cowmilker08** · 06-18-2010

Well, I replaced that plug wire, and its not fixed.
The problem has improved some though.
It only stumbles when you lug it down below about 2200-2300 rpm.
Like when you in OD going pretty slow and trying to accelerate.
It has not stumbled above 2500rpm since I changed these things.

**01gpgt01** · 06-18-2010

try swaping coils with another on your carsee if it follows,Then if that doesnt work swap around the injector with another cylinders injector and see if the misfire follows.

**cowmilker08** · 06-20-2010

That's a good idea, but for some reason it won't set a code.
It took 6 weeks before the first code was set. And it hasn't set another code yet.

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