1998 Plymouth Voyager Loss of power, 2 days after timing be

Engine Mechanical problem
1998 Plymouth Voyager 6 cyl 148, 00 miles

Hi,

I'm trying to help a friend here.

The timing belt broke in her '98 Plymouth Voyager V-6 at 148,000 mi.

She had it fixed by a local mechanic and it worked fine for two days.

Then, I was driving it on the highway, and the check engine light started to blink and I detected a definite loss of power.

I continued my trip, having trouble getting up hills and up to speed, stalling out at traffic lights.

I brought it to an AutoZ, and they plugged the computer in and it came up "random misfire", replace plugs, wires, etc.

I took it back to the local mechanic and he said that his timing belt fix was definitely good. He recommends changing the plugs, etc.

I took it to the mechanic where I work and he says it sounds like something is restricting the exhaust and suggests that I open up the exhaust before the Catylitic Converter and see how it runs, but that's a little too much work for me.

I was wondering if anyone here has inside knowledge into problems with this model vehical, or any other insights. Like, could the timing belt have jumped a notch, after two days?

I feel obligated to help her because she lives across the country but has a house here in Georgia and lets me use her van when she's not around. She doesn't blame me for the breakdowns, but I am the "gal in the trenches", kinda, and am trying to figure this out while spending a minimum of money!

haha,

thanks, sorry I"m so long winded, but I like to be thorough.

TIA.