Engine runs rough at idle, new plugs and air filter, could it be bad gas or water in line or bad fuel filter?
It could be a fuel problem, but in most cases the rough running would continue at road speed.
You could certainly change the fuel filter and see what happens.
A rough idle but no problems on the road would point to a vac problem or maybe a burnt valve. A fuel or ignition problem would be at most speeds including when you put the engine under a load.
Its possible to have a faulty injector on one cylinder that is bad enough to cause a miss at idle but smooth out on the road, but that is a rare occurance.
SOURCE: 2003 cadillac deville rough idle with blinking ses
have the head gasket checked,pretty common on these
SOURCE: 95 cadillac eldorado engine stalls rough idle check engine light is on
My son has this same car with the same problem. So far after tune up and other process of illimination, the problem points to the catalytic converter. If it is clogged you will get this problem with the rough idle and stalling. Look under the car at night after running it and see if the catalytic glows red. If so you need a new one. Hope this helps.
SOURCE: rough idle after warm up
I'd take a look at the temp sender...the engines computer may be
"thinking" the engine is still cold when it's not. That would cause it
run rich (and rough) after it's warmed up. Generally the sender can be
tested with an ordinary volt/ohmeter but you will need the
specifications available in most inexpensive manuals. As with any
complicated electronics system, I can only give you my best guess,
without the luxury of doing any hands-on testing myself.
Good Luck!!
SOURCE: cant start 94 cadillac elderado
Check fuel pump pressure and fuel pump regulator. It sounds like you are not getting fuel into the system and if you are you are not getting enough fuel into the system
SOURCE: SeaFoam in my 94 Cadillac Eldorado. Bad idea!
I doubt the Sea Foam had anything to do with that. I'd check for a vacuum hose off, especially by the PCV valve. Maybe a broken hose or the PCV valve itself might be stuck. Maybe just put a new one in, they are not that spendy. No vacuum would explain the brakes not working.
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