my 1988 mustang gt convertible usually runs great but sometimes it idles up and down and will even die. the problem stops when i accelerate but will continue at cruising speed. sometimes it does not happen for days, then when it happens it can last for a few seconds up to a day. i have replaced the cap, rotor, plugs, wires, fuel filter and egr valve. it feels like a vacuum issue, but i do not think a vacuum issue would come and go like this. i am lost! please help

Asked by jeffmcdermott Mar 11, 2015 at 06:28 AM about the 1988 Ford Mustang GT Convertible RWD

Question type: Maintenance & Repair

my 1988 mustang gt convertible usually runs great but sometimes it idles up and down
and will even die. the problem stops when i accelerate but will continue at cruising
speed. sometimes it does not happen for days, then when it happens it can last for a
few seconds up to a day. i have replaced the cap, rotor, plugs, wires, fuel filter and egr
valve. it feels like a vacuum issue, but i do not think a vacuum issue would come and
go like this. i am lost! please help

115

TopSubaruGarage answered 9 years ago

I conquer with tennisshoes, also consider checking on the condition of your engine mountings please.

Mark helpful

Guru5VNV2 answered 6 years ago

vapor return valve stuck open causes throttle surging at idle in park. Car sucks air though vent- runs lean- idle surges- ecm compensates- rpm drops- vicious cycle.

3 people found this helpful.

Mark helpful

98stanggt answered 3 years ago

Guru where is the vapor return valve located on this model

1 people found this helpful.

Mark helpful

Your Answer:

my 1988 mustang gt convertible usually runs great but sometimes it idles up and down and will even die. the problem stops when i accelerate but will continue at cruising speed. sometimes it does not happen for days, then when it happens it can last for a few seconds up to a day. i have replaced the cap, rotor, plugs, wires, fuel filter and egr valve. it feels like a vacuum issue, but i do not think a vacuum issue would come and go like this. i am lost! please help 3 Answers

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