Slow rough takeoff at times evens out a higher speeds then rough going uphill, it haven't backfired but does seems to miss, service engine lights on ,autozone and oreilly says evaps system, had this problem last year got a new gas cap fill the tank up and light went out, seems like a seasonal thing, like when it warms up
SOURCE: service engine soon light is
How's that gas cap doing? It's part of the canister circuit and Will cause this code if the seal is leaking...accordianman
SOURCE: engine runs rough at certain speeds 3.0 v6 flex-fuel 1999 ranger
Check and see if the EGR valve is leaking, to check this spray water on it at idle, if the water steams off the valve is leaking and is the source of your problem, also are you sure you hooked the new DPFE sensor up right? re-check it..
SOURCE: 1988 ford f150 running rough
Might want to change o2 sensor's, If they are not sending the right single its tell the computer to dump fuel. 1988 was using a fuel density system.
(1989 came out with Mass air flow system)
Check this
I think it might have a TFI module that's not working right. Located under distributor. Its gray and about 4" long and if equip, you need a 4 or 5.5 mm tool to unbolt it. This was a common thing back in the 80's. Its been so long I can't remember if the 4.9 straight 6 had it or not.
T- Thick
F- Film
I- Ignition module
SOURCE: I have 1997 F150,check engine light came on, took
maybe a fuse is blown? did you have the mechanic check the fuses? or even check all your relays and wiring?
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