My 1998 Volvo S90 seems to stall at low rpms but drives well on the freeway. At stop signs an stop lights the car seems to looses power and then regain power as it speeds up. Any one can help, i repplaced acouple of wires and fuel filter same problem though.

SOURCE: 1999 Volvo S70 Stalls at stop signs and traffic lights

These models had a problem with the electronic control modules, and this is what controls the idle speed. Sometimes they just need to be cleaned, but sometimes they are defective. Volvo has extended the warranty on some of them to 10 years or 200,000 miles if it is found to be defective.

http://repairpal.com/volvo-s70-1999

Marvin

• 85242 Answers
• Posted on Jan 13, 2009

SOURCE: dodge ram 1500 engine rpms surge at freeway speed

those sensors could cause the issue, clean the MAF 1st, also clean the idle system using the following procedure, the IAC can cause cruise surge. I use this to cure these problems all the time.

Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve (IAC) and throttle valve, they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

SOURCE: 2000 Lincoln Navigator Stalling at low RPMS sporadically

Idle Air Control (IAC) motor is sticking.You can try taking it off and cleaning it but most likely will have to replace it.

SOURCE: My Volvo 960 stalls while driving

It could be a number of things. Fuel Flow problem, or electrical apparatus heats up and works inefficiently. You could start from the cheaper, less strainous solutions, in this order: Change Fuel Filter, and clean Nozzles. Fuel Pump, Air Mass Meter.