We had our local mechanic replace the timing belt on our '93 Olds DOHC, a few months ago.
Ever since we've had problems.
The first problem was the check engine light came on.
Took it back & they cleared the codes, replaced an 02 sensor ....No problem! All fixed!(with $200 of our money)
Next problem: Car runs like crap when cold.
Check engine light on again.
Back to the mechanic....
No problem! Just needs some new hoses! Old car & all that. We'll get it all fixed up & clear the codes....
Check engine light AGAIN! Car is running WORSE!
No problem! Just needs a tune up! We'll clear the codes & everything will be fine!
$400 later....the car still runs like crap & don't get me started on how far in the crapper our gas mileage is...
I'm thinking the timing is off somehow & husband says: Oh, maybe we got some bad gas, It's been cold/rainy/warm.I probably flooded it....
I really think the (usually )wonderful mechanics didn't quite get everything linged up right when they did the timing belt..