Need some help with 89

[crzycrkr]

Okay, I have an 89, stock except for an intake, with 233,xxx on it. Always ran great until very recently. In between, say 1200 and 1800 rpms I have a stutter or miss while cruising in that range. If I jump on it it is not noticable. When I take my foot off the gas from A higher rpm I get a bubbling sound out of the exhaust when it passes throught that range. Kinda sounds like a backpressure problem. Computer is throwing no codes. ANy ideas. The car has alway run great and it is driving me nuts. Thanks

[180fan]

do a tune up.

[crzycrkr]

Tune up is fresh. I was wondering more along the lines of what sensors I should look into that wouldn't show up on the computer.

[180fan]

tps calibration, replace coolant temp, clean mafs, check timing.