My 2004, 5.3L, 4x4 spudders when ideling or stoped at a light.Also running
the idle up you can feel it till 1700rpm, driving down the roadit goes
away. Had at the dealer three times, said couldn't find any codes but they
can feel the spudder. Checked everything, furl pressure, compresion,
injectors. Said they checked out fine and that the only way to find out
what it is is to waite for it to quit running. Another respected mecanic
said to have it put on an engen anlizer, that will tell you what the
diagnostic wont. Another thing is after you start it and take off when the
engen is cold you can feel a clunk in the gas pedel when it goes from
first to second gear. Any Info Thanks Craig.
I'd say the clunk in the gas pedal is a bad motor or trans mount:
Most likely the trans mount. As far as to wait for it to quit running, ask
for a loaner car and let the manager drive it till he gets stranded!
I'd go with the five gas analyzer for a test drive, my bet is on a leaky
injector, or even a partially stuck EGR Valve.
A leaky injector can cause a very rough idle, sometimes a tooth chattering
vibration. It might show up on a fuel pressure leak down test, or it may
not, sometimes it will only leak dynamically under driving conditions, so
that's where the portable five-gas exhaust analyzer comes in. That will show
a leaky injector or even a sticking EGR Valve.
I hope this helps?
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