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Apr 9, 2007 | 08:52 PM

rustee90-150

Thread Starter

Senior User

Joined: Jan 2007

Posts: 186

Likes: 1

From: watford, ontario

need help

i have a 90 150 302 the engine runs rough it performs fine it just has a little bounce to it when its idling i just bought a 91 f150 302 and the engine in it hardly bounces at all when its idling i dont understand it ive done a tuneup on my 90 new wires plugs cap rodor what is up

Apr 10, 2007 | 05:35 PM

12engine

Postmaster

Joined: Oct 2006

Posts: 4,056

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From: Waterford, CT

rustee, it might be a motor mount. if not, i dont know.

Apr 10, 2007 | 06:03 PM

Bruce R Leech

Elder User

Joined: Feb 2007

Posts: 707

Likes: 1

From: Mulege south Baja ca. Mx.

check the codes and post them here. it could be one of a hundred things so dont start replacing parts untill you have checked them and know that they are bad. we can help you with that, but first check the codes. and all connections and vacuum hoses

Apr 10, 2007 | 10:13 PM

Dryfire152

Junior User

Joined: Sep 2006

Posts: 83

Likes: 0

From: Washington County, ME

Check TPS, cracked plug,TFI, Did you use dialectric grease on plug wires. Also coil could be weak, if a plug has a wide gap, than a weak coil will not let the spark jump gap.