1992 Ford Explorer - 4.0L Jasper Eng Rough Idle

kceps11 · Post by **kceps11** » Wed Feb 10, 2010 8:50 am

put a new jasper motor in runs rough in park idles fine in drive anyone have any ideas
wires and plugs are fine and so are the fuel injectors

brianp87 · Post by **brianp87** » Wed Feb 10, 2010 9:00 am

What are your fuel trims

Bobt1 · Post by **Bobt1** » Wed Feb 10, 2010 1:04 pm

Give Jasper a call,

brianp87 · Post by **brianp87** » Wed Feb 10, 2010 3:17 pm

Doubtful its engine. We need more info if you want any help

RevPerformance · Post by **RevPerformance** » Wed Feb 10, 2010 11:53 pm

Make sure you are using autolite plugs. I had an explorer with brand new bosch plugs in run like crap and misfire. Put in autolites and no issues.

steven kiser · Post by **steven kiser** » Thu Feb 11, 2010 3:18 am

sounds like a vac leak. these intakes do crack.

brianp87 · Post by **brianp87** » Thu Feb 11, 2010 5:43 am

brianp87 wrote:What are your fuel trims

brianp87 · Post by **brianp87** » Fri Feb 12, 2010 8:31 am

Hmm gotta love the ones that ask for help but dont want to provide feedback. so frustrating Im about to give up