My 2000 Saab 95 is hesitating real bad idles real rough

Are you talking about a go-cart, or a motorcycle, or a tractor-trailer 18 wheeler? Then OF COURSE, you must IDENTIFY the MAKE, the MODEL, and the YEAR of whatever vehicle you are asking about, if you want any REAL help!

1996 Dodge Stratus stalls at stop lights and in idle - DodgeTalk ...

www.dodgetalk.com > ... > Dodge Stratus 1st Gen (95 - 00)

Apr 10, 2003 - I replaced water pump on my 1996 stratus and now the car runs real bad, but only when coming to stop light or in idle. any suggestions on ... 2000 Stratus oil light comes on and car dies
Dec 3, 2011
97 Dodge Ram 1500, stalling while Idle (yes theres a few of these ...
Nov 2, 2011
Rough idle/hesitation problem with a twist
Jun 22, 2011
98 Grand Caravan stalls / surges on idle
Jan 29, 2007
More results from www.dodgetalk.com

is your saab petrol or diesel?

Hei, the most likely is a fault ignition cassette or injector nr 5!? If you have a scope and know how to use it, is easy to see where is the fault!

Uptake valve? I've never heard of an uptake valve, but there is a idle
bypass valve, which when in need of cleaning or bad, will make a car
have a really rough idle.

could be EGR, Idle air control valve, is it running rough when driving or is there any white smoke out the tailpipe

Have you had your mass air meter checked or replaced? This is the unit attached to the air intake hose behind your air filter. It senses the air temperature, speed, density, etc... and adjusts the fuel/air ratio to keep the vehicle running at "peak" performance. Also, check your TPS (throttle positioning sensor) it can also cause the problem you speak of. The TPS adjusts your engine speed/idle etc. and also compensates for hot/cold changes etc. This is roughly a $35.00 part and in most cases usually an easy fix.

NO. replacement is the only option after it is verified by a qualified shop that it is indeed bad.

hard to start/or will not start; very low mpg. rough idle/acceleration

When I was building my 97 GSX, I ran into this same problem. I found that I had a bad vacuum leak. Of course, this was after I had done a tune up, changed the fuel pump, injectors, etc.

Let it warm up without driving. Set you idle a little higher by adjusting the idle screw on the throttle body to about 2500 or so. If it does the same while sitting then you can start checking for leaks. Acquire a can of starter fluid from your local auto store. Spray in different areas, short burst (DO NOT blanket the engine area) around the engine compartment, 1 at a time. If the idle changes then returns that is the rough area of the leak. Look around that area and see what it could be. Then you can start fixing the problem.

If not then you will need to get a vacuum tester. You can rent them (Autozone, Advance Auto, NAPA) or find a shop (though that would cost you more) that could check it for you.Follow the directions on the tester.