[labdog]

I have a 1986 305 TPI from an 86 Camaro in my truck. Has run great untill Satutday when at GOOD GUYS car show sittting in line it died. Starts back up but would not idle unless you gave it gas, made it home but had to hold accelerator peddle a little to keep it running, ran fine on the highway home but would not idle at stop lights. Once I got home and pulled into garage it worked fine ??? I did notice my inline fuel pump was noisey and the fuel line coming out of the pump was vibrating, I replaced filters a week ago and it ran fine untill this. Could a faulty fuel pump cause it to not idle but run fine on highway or should I check the TPS and IAC sensors. . I have a new fuel pump ordered don't like the intermitent noisy pump. Thanks for the help

 

[labdog]

Put vacuum gauge on engine and it held steady not jumpimg around even when I raised rpm. No egr valve on engine it's a swap into a 1950 Ford F1 truck. Checked TPS it was ok, ckecked fuel pressure it was ok. My fuel pump making a racket seems intermitet thats why I was going to change it. Ran fine on today while testing. I wonder if I might have some bad gas ? I filled up prior to leaving sat morning.

 

[labdog]

yes tank is vented.

 

[labdog]

Checked for codes no codes only flashes 12.