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Motor is shaking and idles low, also gas mileage is really bad......do you think it could be in need of a tuneup or???? How much does a tuneup cost and where is the best place to get one done?  
 
Edited by leeway, 2018-02-10 21:50:46

Year, make, model, engine, mileage.

2008 Buick allure and less than 200k. Idk about engine

Give Thomas at Tb repair a call hes really good he has an ad on here

There really is no such thing anymore. Modern engines, something goes wrong, it is parts replacement.  
 
Could be anything, or a variety of things. You need the problem(s) diagnosed.

To you both for answering my post. I will make an appointment at TB Repair to get it checked up. Have a good evening

good chance it will need a set of spark plugs

Engine shaking often indicates a hard misfire. If your car has never had spark plugs AND ignition wires replaced, please have that done. Your owners manual indicates they should be replaced at or before the 5yr/160,000km threshold and for good reason.  
Is your check engine light illuminated? Or worse-flashing? Have it looked at promptly to avoid catalytic converter damage from a hard misfire.  
Good luck!

I took it out for a drive today in the city and got excited because the engine light is on but not flashing. Then when I went out of the city as soon as I got to 2000 rpm's the engine lighted started to flash. How much am I looking at $ wise?

I had that a month ago. '03 Grand Prix, similar car, same engine. I needed both the MAF and MASS sensors. They were about $100 a piece, plus diagnosis time, plus labour, etc. Now, my shop charges me $81 an hour. Uptown prices are more like $120.

Had a clogged cat a year before.  
 
You are at about that mileage where a lot of maintenance starts needing to be done. Transmission service, engine flush and fill, etc.

TheScotsman said "Had a clogged cat a year before.     You are at about that mileage where a lot of maintenance starts needing to be done. Transmission service, engine flush and fill, etc. "

Where is your garage? 81 is a pretty good deal

I bought my car from him.

Ok. Your car has a problem. Plugs and wires are the most likely thing it needs. If they've never been done it's time. Flashing check engine light is bad.  
You've been given some very good advice so far to bring the car to a reputable and affordable shop now- not later. The more you drive the vehicle like this, the more harm done = a much, much bigger bill later. Spending $3-400 now (shouldn't need that much) is so much less than having much costlier repairs from stubborn neglect later.  
Get the car scanned. Likely has a code in the P0300-P0306 range telling you of the misfire.  
Have it easily diagnosed: spark plugs or wires or coil packs likely at fault.  
Replace worn or defective components  
Re-test running condition, and have the fuel trim reset via scan tool.  
Then spend the little bit extra on an engine oil change- as with misfires unburnt fuel not only can overheat the catalytic converter, it can wash down the piston rings of the affected cylinder(s) causing poor compression, premature component wear and fuel can actually start to work past the rings and dilute your engine oil, again causing wear to other engine parts.  
 
Please. Save yourself your hard-earned cash and maintain your vehicle now.  
Otherwise you may regret your repair bill later. (I'm in the industry and see it all the time)

Have an appointment for Thursday morning. Today my nephew is going to change my wires and plugs for me and me DIL is changing my fuel and air filter. Thank you all for the advise! Have a great day

Those few things alone will make a great difference.