Jeep Cherokee 4.7 v8 low on power, poor running, hesitation?

Jim

New member
Hi, my '99 Jeep Grand Cherokee is low on power. If you use the kickdown it dies off and omits a strange smell from the exhaust. Sometimes it runs ok. I've changed plugs and filter, no difference.
I had it serviced recently to see if that helped (hence plugs + filters changed) No the check engine light is not on. I know the cat is poor as emissions are slightly up (0.8 co2) but the cat is not blocked (as they inspected it)
 
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