2001 vw cabrio throwing p0121 will idle fine but when trying to drive will starting spitting and sputtering and will die but will start right back up

SOURCE: 1995 pontiac bonneville stalls

I just went through lots of troubleshooting and expense on my 1996. Whenever I would lift my foot off the accelerator and was below about 30 mph, the rpm's would starts jumping around and sometimes it would stall. If I gave it a little gas (accelerator), I could sometimes keep it running. It also backfired once in a while. Starts right back up. Also, if I let it idle while in part, it would die after 1-2 minutes.

I ended up finding a hole in the fuel regulator. About a ~$70 part if you get an AC Delco, but very simple to change.

SOURCE: 1995 Jeep Wrangler 2.5 4cyl spits and sputters while driving

have you considered checking alternator and battery? just a thought

Marvin

• 85242 Answers
• Posted on Apr 18, 2009

SOURCE: idles fine then dies when put in drive or reverse

You may have a problem with idle speed control motor or ETC as GM calles it. here is a photo and a price from rockauto.com.
STANDARD MOTOR PRODUCTS Part # SA4
Motor Assembly $110.99

SOURCE: engine sputtered, then died. Towed home. I

Might be fuel pump, or filter is pluged up, best to chg. filter and then do a fuel pressure test.

SOURCE: VW CODES

Those codes mean there's an issue with your MAF, Throttle Body Sensor, Fuel System, Engine Misfires



Start with the MAF first as that can cause the other issues to appear (ex. fuel issue because your MAF says it needs more fuel so your engine is getting flooded and stalling.

Then look at the Throttle body and have the replaced if the issue still occurs... Then look at the fuel injectors and fuel delivery system (lines, gas tank, gas pump, etc)

Your engine misfires seem to be the result of any of the previous....

Testimonial: "all this makes sense the gas gage has been running wild for years up an down a as gotten worst so maybe the pump and sending unit"