01f1502wd

cool cool. let me know and ill see what else I come up with. i could use the 10 bucks. (but with paypal ill only see like $9.70 due to fees lol)

kb8rhu

Pull your distributor cap off and check the magnetic pick up. I could almost bet you the magnet is cracked. When its cold its in one piece, when it heats up it comes apart. Had that happen to my 81 5.0

iowaredneck

After reading all the entries, you hit the nail on the head. Sounds like a distributor cap to me.

Good old Bill

Agreed with the 190 t-stat, lets not have the PCM going back into open loop on us. I don't understand the 20-25 PSI pressure at running speeds. To be honest, can't remember ever having to check pressure while driving. At running speeds we know vaccuum is less and is controlling the regulator, check for possible vac leak. Is there anyone you could swap the PCM with for a test? And finally are there any codes to assist us, or are we working blind? A nasty but intrigueing problem, a couple of other older (more experienced) guys here, lets see what they cough up.

FOMOCO466

Take off the fuel cap and run the truck to see if it happens...if your getting a fuel system vapor lock the pumps wont be able to suck fuel from the tank. if the vent hose from the tank is plugged it can't get air into the tank to allow the fuel to be pulled. it'll run right while there is air in the tank till you suck it all out.... does it do the same with both tanks...

Good old Bill

^ good thought, however, believe these caps are not vented and the system vents thru carbon canister. Still, looking into the vent line has merrit.

hcbph

Sounds like you're going through what I did with a Torino I used to own. Checked or changed just about everything without any improvement. Finally on a lark, I changed out the flex fuel lines, problem gone. I couldn't find anything 'proof positive' but I found some flaking and decomposition in the sections I cut apart. I think it may have been a combination of heat and pressure was pushing junk to the point the line was partially closed off. replacing those sections of line worked for me.

Good luck in your search.

Paul

rayski

i am wondering were the fuel pumps aftermarket? we have had issues with the pumps not maintaining proper pressure. went to ford put in oem pump -- no problems. ford likes to see 50 - 55 psi all the other pumps would not keep the pressure up --------good luck

Good old Bill

50-55 PSI thats news to me!

whitetrucks

I agree with the possibility of failing flexible fuel lines. also try loosening the gas cap when the symptoms show up. if they go away for another slice of time it's a venting or return air issue.