95 eclipse idles high, sputters at 4000 rpm, awful gas mileage and maybe misfiring. Any ideas?

Check for fuel restriction. Sock inside tank (maybe stopping up), fuel filter dirty, fuel pump.

need more input. (8valve or 16valve engine , which option?)
black top engine , or silver 16)?
does it fail, cold or hot engine or both?
does it have full power from engine , at all speeds and loads (hills)?
and wide open throttle power.?
ever do the 60k tune up, not just a fuel filter?
http://www.fixkick.com/IGN_timing/tune-ups.html

how old is the fuel?
the pump/reg holds 34-43 psi.at all times...running.
sputter, from too low RPM ? below 800
or idle fast, but sputters at 800 and more?
if the latter, that is called misfire.
if the former that is lost of idle controls.
need to now which engine. because the are worlds apart.
EFI wise !

but here is a page on misfire. "sputter"
50 reaons and more causes.
we dont guess, we do about 5 tests and bingo....

http://www.fixkick.com/misfiring.html


when was the last time it ran good,?

4000 rpm is pretty high..it may have a fuel cut off for extremely high operation to prevent blowing it up..why so high?? most run between 2200-3000rpm..not 4000...

It wouldn't hurt to change the plugs. I never run plugs over 20k in my cars. Also, I've said this a lot in answering similar questions here, but check the O2 sensor, if it's clogged the vehicle can run rough especially when its idling and can go away when the RPM's climb

Check out related help links to troubleshoot these problem:----Click the link below:---Idles Fine but RPM jumps in drive mode? http://technoanswers.blogspot.in/2012/07/idles-fine-but-rpm-jumps-in-drive-mode.html
---------Mitsubishi Lancer rpm needle bounces? http://technoanswers.blogspot.in/2012/02/mitsubishi-lancer-rpm-needle-bounces.html
--------How to adjust rpm on 2009 dodge charger SRT8?

http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
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Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html

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Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

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High rpm in neutral? Inconsistant high RPM in neutral? http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

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Jetski Sputters and Low RPM? http://whatisbyme.blogspot.in/2012/07/jetski-sputters-and-low-rpm.html

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Fuel Injection Problem And RPM suddenly increases http://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html

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2005 Toyota Highlander: Engine runs hard RPM below 3000? http://whatisbyme.blogspot.in/2012/05/2005-toyota-highlander-engine-runs-hard.html

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1987 Toyota Camry: RPM Drops going Up hills? http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html

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Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

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1990 Toyota 4Runner: Engine cuts off when reaches 2000 RPM?

http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

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1999 Toyota Camry: Erratic stalling and high engine RPM at idle?

http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

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1995 Toyota LS: Misfire at idle or low RPM http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

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Lexus RX: Tapping noise under Valve Cover At Low RPM? http://technoanswers.blogspot.in/2012/04/lexus-rx-tapping-noise-under-valve.html

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These will help.
Thanks.

Hi Rodrigo, The idle control is activated by the temperature sender unit. It sounds as though yours is giving a cold signal to the computer and it pushes up the idle speed to compensate as if it has just started. The sender unit is a different unit from that which operates the gauge on the dash instrument panel. Replace it and I believe your problems will be over.Regards John

replace my motor on my 95 eclipes when i turn it on idle stays at 4,000 rpm what can i do

Check for vacuum leaks.

HELLO. WELL YOUR ALMOST RIGHT,. WHAT YOU NEED TO DO . IS CHANGE YOUR MAP. CENSER'S . AND THAT SHOULD DO THE TRICK . WELL HOPE THIS HELP'S YOU , GOOD LUCK

Check for a vaccum leak at the intake. With the engine at idle spray a bit of starting fluid to find it. You will hear the engine pick-up when you hit the spot. Change the necessary gasket. Hopefully this will solve your prob! Frankster016