97 Chevy Express 1500 problems with idling, stalling and revving to high.

Still trying to figure out what's wrong with our van. This is the list of what we've done:
full tune up, replaced speed sensor, EGR valve and gasket, mass air flow sensor, Cat converter, all 4 02 sensors. We're wondering if it's the IAC valve, vacuum leak, fuel pump, or fuel pressure regulator. We did a SeaFoam Motor Treament. It's to the point where it won't start (wants to start, just won't turn over). We poured a bit of gas in the throttle body and it will start.
We're thinking vacuum leak, or replacing the Idle Control Valve, or the Fuel Pressure Regulator.

Category:

Autos & Vehicles

Tags:

• Chevy
• Express
• 97
• problems

[wtsncrew]

We sold the van to a mechanic friend. He opened up the computer box and it was dirty and corroded. He replaced it and it's ran fine since (almost a year now)

I 'fired' my regular mechanic. And we bought a Ford.

[wtsncrew]

The problem turned out to be the computer box.

[vansman3]

@wtsncrew could you explain to me wht you mean about the computer box and how u came to find out that it was the box because im having the same issues with my 88 chevy truck

[vansman3]

@wtsncrew cold u go into further detail with how u found out n wht u man bout computer box cuz im having the same problem with my 88 chevy truck

[kaleb011]

its proble the IAC (idle air control valve) did you have a check engine light

[xXwhygodwhyXx]

I was having egr flow problem and my engine would immediately cut off but power will still be on. This would randomly occur and sometimes when stop at a traffic light, I would have to turn car off and turn it on twice to get it working. My computer knew that I had insufficient egr flow so check your code reader.

[xXwhygodwhyXx]

If your having an egr valve problem, your check engine light will come on and you will get a code saying insufficient egr flow.

[pitolon86]

fuel pressure regulator

[Olivier1981]

I'm experimenting the same problem! Changed the EGR valve and mass air flow... Cleaned the Throttle body... Nothing works... What was the solution with your van??

Thanks!

[poilty98]

I replaced the throttle body and the throttle body position sensor that was expensive. Try changing the wire harness connected to the TBPS. It will save you the expense i went through to find out it was the problem. Hope this helps