While driving easily, speed about 65-70 mph, the check engine light comes on. No noticeable abnormal engine behavior was noticed.

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Surging While Driving Between 40 and 50 MPH : Chrysler ...

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Around 35 mph (common street speeds) the engine will sometimes surge with noticeable tach fluctuations. ... I have a surge when coasting around 40-45 mph.

Enginge surges RPMS drop while driving [Archive] - Chevy ...

forums.trailvoy.com > ... > OEM Issues

Mar 17, 2012 - 19 posts - ‎7 authors
[Archive] Enginge surges RPMS drop while driving OEM Issues. ... I so hope somebody has a clue as to what is causing my '02 Envoy's (182k) engine to ... I'll be driving and when I get up to around 35 - 45 MPH sometimes my ...

Hesitation and bucking on acceleration - F150online Forums

www.f150online.com/...engines/476391-hesitation-bucking-acceleration....

Do you have an OBDII scanner to check the real temperature? Want to make sure it's not overheating. If it's normal, could be your temperature sensor starting to go out, or ignition switch. Any check engine lights? If so, get the code for me, can go from there. At a constant speed, you sure it wasn't a misfire instead? Check your trans fluid, make sure it's full. I was just in Tahoe, pretty sad not much snow at all.

What year model?Do you have a check engine light on?describe the abnormal operation.

You need to find if your problem is coming from front or rear first.Do a test drive where you can drive at slow speed with no traffic an a good road.At 10 to 15 mph,
notice if the steering wheel is rocking left then right.If itis your problem is in the front wheels,if it doesn't pick up speed to 15 to 20mph,notice whether your back side is rocking left and right,if it does your probable is in the rear wheels.Next is to see the wheels on a spin balancer to check for steel belt shifting in tire or bent wheels.If none of this helps you didn't mention any sounds,but check the u joints

I would start looking for a vacuum leak. Check all the vacuum lines for cracks or breakage. Spray penetrating fluid on them until you hear the engine start to stumble then focus the spray on that area until you are able to pinpoint the location of the leak. Best of luck,my friend, Dana

i need engine for kia rio 205 to by

If it's the check engine light, I'd look at the radiator for partial internal obstruction...In colder temps or running at speed it tends to run a bit cooler. RPM change may be computer attempting to compensate for this. I'm not a KIA expert, but this applies to any vehicle. Also check your coolant level. If it's low it will also act this way.

Go to Advance Auot parts store or Auto Zone store they will scan it for free and take gas work out of it or buy a scanner they are cheap now very very good investment

A few different things could be causing this, most are internal engine components. First off, take your tires and have them balanced to make sure you didn't accidently fling off a tire weight when you hit a pothole. Next, if that is not it, either you have a blown head gasket, cracked rings, or bad rod/main bearings.

could be the spark plugs not gapped enough.if they are gap less than indicated then u will noticed when going at higher speed.