I have a 1998 ford f150 and it is missing bad and I have replaced the spark plugs and the fuel filter and no check engine light is on

For best results, use the Motorcraft spark plugs that originally came in the truck. After that, use Autolites. Consider changing the spark plug wires. If the problem persists, check/replace the coil. Ensure plug wires are properly seated on the coil and plugs.

When you drive the truck does it shudder? And does it ever seem to stop doing it at certain rpms? V6 or V8?

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Originally Posted by wilddog27

when ya drive the truck does it shudder? and does it ever seem to stop doing it at certain rpms? V6 or V8?

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v6 4.2L
Yea it shudders when I start to slow down and also when I'm at idol when it is in drive it also does it when its in park but not as bad but I gess I should try a air filter and spark plug wires..

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Originally Posted by txgreasemonkey

For best results, use the Motorcraft spark plugs that originally came in the truck. After that, use Autolites. Consider changing the spark plug wires. If the problem persists, check/replace the coil. Ensure plug wires are properly seated on the coil and plugs.

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Ok that's what I thought about doing was to chang the spark plug wires and the air filter. I did put the autolite spark plugs in there about a month ago..

Well my boss has the same truck doing the same thing! They changed plugs and wires twice also put new injectors in.. Computer shows dead miss on cylinder 5. Compression test showed everything was OK... But now they are saying that the coil is bad... Also heard from a ase certified mechanic at dealer ship that motor was bad about having egr problems. Supposedly there is a port in the head that can get clogged up and cause it to run really rough. Truck is in shop I'll let you know if they ever figure it out.

Well no luck on the truck. Now they saying it's a burnt valve. Did you ever figure out your truck's problem