Every time wen I start my car it runs bad (between 600/700 rpm) for like 15 20 seconds and after that it runs fine , I think it gets to many gas .

even when I turn the car of and start it immediately it does the same

what I changed so far is

map sensor
throttle position sensor
coolant sensor
egr
spark plugs + wires
fuel pressure regulator
idle control regulator

after replacing all these parts it still has the same problem

the car has no obd !!

Any ideas???

 

I'd clean the MAF sensor. You can use MAF cleaner, contact cleaner or soak it in rubbing alcohol for 12 hours (make sure it's dry before installation) I like the contact cleaner as it can be used for other things and works just as well a MAF cleaner does and its cheaper.

The MAP sensors rarely cause issues, IME.

Use some dielectric grease on the plug too.

 

the 98 doesn’t have a maf sensor as far as I know

 

the 2.2 doesn’t have a maf sensor 😀

 

My mistake if it does not. I assumed mistakenly that all Chevys built past the 1998-1999 models did have a MAF sensor.

 

wonder if a lazy O2 sensor will do this?

 

I will change that one this week
I’ll keep you posted
thanks

 

i really hate just tossing parts at a vehicle

 

Thankzzz

 

replaced the o2 sensor no difference