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90 4.0 running rich


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The truck starts good will drive just fine going down the road. Everytime you stop it dies. When it does you can smell gas. To get the truck to start again you have to crank and crank and pump the gas. This truck has been doing this since i got it about 10yrs ago. I changed the tps and cps made no difference. I put another computer from a salavage yard in it and that seemed to help. I gave the truck to my dad probably 3 yrs ago. And now the truck is back to its old ways. It will run all day long as long as you don't stop.

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It looks like that's coming off your EGR valve transducer. One end coming off the top of the transducer goes to the EGR valve and the other to part of the vacuum line harness. If you don't have the actual harness I suggest you get it, Cruiser's tips has all the part numbers for it. Look at the end of this post for some pictures of the vacuum harness.

 

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It starts rignt up and drives great going down the road. When you stop it dies and i smell gas. I have to crank and crank and give it gas to start it back up. It will drive down the road fine. Except now ive noticed its starting to hesitate and buck when your going around 40mph sometimes. These problems are sperratic. I drove it sunday and it died 4 times. Yesterday i let it idle for 20 min and it never died. I drove it about 10miles and it only died once

 

 

I wonder if your EGR valve isn't hung open.....

 

You have cleaned the throttle body and IAC?

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