87 Bronco2 2.9 running rough

Ask technical questions about your Ford Bronco II here. Technical write-ups on your axle swaps, engine swaps, chop tops, etc. are encouraged.
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Posts: 1
Joined: Mon Mar 04, 2019 7:49 am
Location: Tennessee

87 Bronco2 2.9 running rough

Post by Bear73 » Mon Mar 04, 2019 7:56 am

I have not replaced anything yet because I just bought it. It runs great while cold, but when reaching normal operating temp it goes to surging like it's misfiring or has bad gas. It only does this while its warmed up. Please help

Posts: 75
Joined: Tue Aug 18, 2009 1:12 pm
Location: FT. Hood, TX.

Re: 87 Bronco2 2.9 running rough

Post by broncofan » Mon May 27, 2019 12:58 pm

Check fuel pressure and clean or replace injectors.
2013 Taurus SHO LMS V11 tune, 06 F150 Harley-Davidson Edition,03 Mustang GT Conv, 97 Jeep GC Laredo 5.2, 84 BII

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Joined: Fri Apr 10, 2020 11:25 pm
Location: PNW, near Seattle Wa

Re: 87 Bronco2 2.9 running rough

Post by Gaz » Fri Apr 10, 2020 11:35 pm


I would look at 2 components; the fuel filter and/or the TFI ignition module ..). The fuel filter is very easy to change and inexpensive. The ignition modules cost a bit more and are plagued by heat and in one of the worst locations, fir a heat sensitive component.

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